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  1. Title: Geologic Units (Polygons): Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This polygon shapefile shows the boundaries of geologic units within the United States. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition of the National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Geologic Units (Polygons): Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/hv829rm6225. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  2. Title: Outlines of Major Calderas and Impact Structures: Generalized Geologic Map of the Conterminous United States, 2005

    Contributors:

    Summary: This line shapefile shows the outlines of major calderas and impact structures in the United States. A caldera is a large, generally circular depression at the summit of a volcano formed when magma is withdrawn or erupted from a shallow underground magma reservoir. An impact structure is a crater formed by the impact of a meteoroid, asteroid, or comet with the Earth.This layer is part of a Generalized Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Outlines of Major Calderas and Impact Structures: Generalized Geologic Map of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/cn501pk8752. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  3. Title: Geologic Unit Text Labels: Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This line shapefile contains text labels (for display purposes) of the geologic line coverage in the United States. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Geologic Unit Text Labels: Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/vp190tb7818. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  4. Title: Geologic Units (Lines): Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This line shapefile shows the outlines of geologic units within the United States. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Geologic Units (Lines): Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/pb687sw0030. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  5. Title: Generalized Glacial Limit Lines with Line Decorations: Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This line shapefile shows the glacial limit lines, with line decorations (added for display purposes) in the United States. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Generalized Glacial Limit Lines with Line Decorations: Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/rx861dz2980. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  6. Title: Fault Lines with Line Decorations: Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This line shapefile represents the major fault lines in the United States. A fault is a fracture or fracture zone in the Earth's crust along which rocks on one side have moved significantly with respect to those on the other side. This layer includes both the faults and the line decorations (added for display purposes).This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition of the National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Fault Lines with Line Decorations: Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/yy930mh7999. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  7. Title: Fault Lines: Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This line shapefile represents the major fault lines in the United States. A fault is a fracture or fracture zone in the Earth's crust along which rocks on one side have moved significantly with respect to those on the other side. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. This layer is part of the 1997-2014 edition National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Fault Lines: Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/tt369vk9000. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  8. Title: Impact Structure Locations: Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This point shapefile shows the locations of impact structures in the United States. An impact structure is a crater formed by the impact of a meteoroid, asteroid, or comet with the Earth.This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Impact Structure Locations: Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/dn768qz2883. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  9. Title: Generalized Glacial Limit Lines: Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This line shapefile shows the glacial limit lines in the United States. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Generalized Glacial Limit Lines: Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/vz874sc7648. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  10. Title: Areas and Facies Types of Metamorphism: Geology of the Conterminous United States, 2005

    Contributors:

    Summary: This line shapefile shows the outlines of major calderas and impact structures in the United States. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition National Atlas of the United States. Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000. National Atlas of the United States. (2005). Areas and Facies Types of Metamorphism: Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/xw442md8231. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  11. Title: State of Minnesota : showing proposed state roads designated by county resolutions

    Contributors:

    Summary: Cartographic Details: Scale [1:1,520,640] (W 97‚Å∞00 π--W 89‚Å∞30 π/N 49‚Å∞30 π--N 43‚Å∞15 π)."January, 1907."Prime meridians: Greenwich and Washington. 47 x 40 centimeters Scale [1:1,520,640] Minnesota Transportation Maps

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  12. Title: Global GIS : Geology of the conterminous United States at 1:2,500,000 scale : Geology

    Contributors:

    Summary: This datalayer is a polygon coverage representing geologic regions of the conterminous United States. It is a digital version of the geology features of H.M. Beikman and P.B. King's Geologic Map of the United States, originally published at a scale of 1:2,500,000 (1974). This version of the datalayer was published as part of the USGS Global GIS : global coverage database (2003). The USGS Global GIS database contains a wealth of USGS and other public domain data, including global coverages of elevation, landcover, seismicity, and resources of minerals and energy at a nominal scale of 1:1 million. The U.S. Geological Survey (USGS) and The American Geological Institute (AGI) announced a cooperative agreement that will focus on making the USGS Global Geographic Information System (GIS) database readily available to educators and the general public in the form of a DVD based world atlas.

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  13. Title: Global GIS : Geology of the conterminous United States at 1:2,500,000 scale : Faults

    Contributors:

    Summary: This datalayer is a polyline coverage representing geologic faults of the conterminous United States. It is a digital version of the fault features of H.M. Beikman and P.B. King's Geologic Map of the United States, originally published at a scale of 1:2,500,000 (1974). This version of the datalayer was published as part of the USGS Global GIS : global coverage database (2003). The USGS Global GIS database contains a wealth of USGS and other public domain data, including global coverages of elevation, landcover, seismicity, and resources of minerals and energy at a nominal scale of 1:1 million. The U.S. Geological Survey (USGS) and The American Geological Institute (AGI) announced a cooperative agreement that will focus on making the USGS Global Geographic Information System (GIS) database readily available to educators and the general public in the form of a DVD based world atlas.

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  14. Title: Geology, New York State, 1974

    Contributors:

    Summary: This dataset is a digital representation of the King and Beikman map. In 1974 the U.S. Geological Survey published a new Geologic Map of the United States (exclusive of Alaska and Hawaii) on a scale of 1:2,500,000, which was compiled between 1967 and 1971 by Philip B. King and Helen M. Beikman, with geologic cartography by Gertrude J. Edmonston. (from King and Beikman, 1974b) The map displays the rocky foundations on which our of investigation of this foundation by a succession of geologists. It is thus a reference work that present and future geologists of the country can consult and is of prime importance in the education of earth scientists in schools and colleges. Further, it can be consulted by geologists in other countries and continents who wish to learn about the geology of the United States; they will compare the map with similar national or continental maps of their own countries. In terms of resources useful to man, the Geologic Map lays out accurately the major regions of bedrock in New York State upon which many facets of our economy depend. It illustrates the areas of stratified rocks that are the sources of most of our fuels, and the areas of crystalline, plutonic, and volcanic rocks that contain important parts of mineral wealth. The map shows areas of complex folding and faulting, parts of which are still tectonically unstable and subject to earthquake hazards. To some extent the bedrock represented on the map also influences surface soils, which are of interest in agriculture and engineering works. Beyond this, the practical value of the map is less tangible, although it can be an important tool for the discerning user. Clearly, the map will not pinpoint the location of the next producing oil well or the next bonanza mine, nor will it give specific advice for the location of a dam or reactor site; these needs can only be satisfied by maps on much larger scales, designed for specific purposes. Nevertheless, the sapient exploration geologist can find upon it significant regional features not apparent to the untrained user. Many great petroleum pools occur in stratigraphic traps, or "wedge belts of porosity," caused by overlap or truncation, the regional occurrence of which can be seen on the map. Important mineral deposits cluster along regional tectonic trends or chains of plutons of specific ages. Finally, the Geologic Map will be used in national planning activities in conjunction with other national maps showing environmental features such as climate, vegetation, and land use --for the location of power transmission corridors, highways, National Parks, wilderness areas, reclamation projects, and the like.

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  15. Title: Map of the Black Hills of Dakota : from explorations made in 1875

    Contributors:

    Summary: 1 in. = 4 miles. Relief shown by hachures and spot heights. "Geology of the Black Hills by Henry Newton E.M."--Upper right. 74 x 89 centimeters Scale [1:253,440]. 1 inch = 4 miles General Map Collection

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  16. Title: A global, self-consistent, hierarchical, high-resolution shoreline database

    Contributors:

    Summary: This collection consists of polygon shapefiles containing high-resolution shoreline data set amalgamated from three databases in the public domain. The data have undergone extensive processing and are free of internal inconsistencies such as erratic points and crossing segments. The shorelines are constructed entirely from hierarchically arranged closed polygons. The data can be used to simplify data searches and data selections or to study the statistical characteristics of shorelines and land masses. The individual polygons are available in 5 resolutions: full, high, intermediate, low, and crude. System requirements: Geographic Information Systems (GIS) software that reads ESRI shapefile format.

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  17. Title: Bromley map of South Boston, Massachusetts, 1891 : Plate 29 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of a map plate of a section of Dorchester, Massachusetts from the Bromley & Co. atlas entitled: Atlas of the City of Boston : from actual surveys and official records, by Geo. W. & Walter S. Bromley. Vol. 8 South Boston, Mass., published 1891. This image is of Plate 29 : Part of Ward 14, South Boston, city of Boston. Scale 1:1,200. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Massachusetts State Plane Coordinate System, Mainland Zone (in Feet) (Fipszone 2001). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. These large scale fire insurance maps typically include: building footprints, building construction material (frame, brick, stone), building assessors areas, selected owner names, selected building functions, property boundaries, building street addresses, street names, railroads, fire hydrants, water main pipelines (with size in inches), sewers, and more. Building construction material is shown by colored shading. The index plate of the atlas includes an explanation of map features. This layer is part of a selection of digitally scanned and georeferenced historic fire insurance and land ownership atlases of Boston and Cambridge, Massachusetts from the Harvard Map Collection. The selection of scanned atlases represents a range of originators and ground condition dates (1873-1916).

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  18. Title: Bromley map of Brighton & Allston, Massachusetts, 1890 : Plate 8 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of a map plate of a section of Dorchester, Massachusetts from the Bromley & Co. atlas entitled: Atlas of the City of Boston : from actual surveys and official records, by Geo. W. & Walter S. Bromley. Vol. 7 Brighton, Mass., published 1890. This image is of Plate 8 : Part of Brighton, Ward 25, city of Boston. Scale 1:1,200. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Massachusetts State Plane Coordinate System, Mainland Zone (in Feet) (Fipszone 2001). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. These large scale fire insurance maps typically include: building footprints, building construction material (frame, brick, stone), building assessors areas, selected owner names, selected building functions, property boundaries, building street addresses, street names, railroads, fire hydrants, water main pipelines (with size in inches), sewers, and more. Building construction material is shown by colored shading. The index plate of the atlas includes an explanation of map features. This layer is part of a selection of digitally scanned and georeferenced historic fire insurance and land ownership atlases of Boston and Cambridge, Massachusetts from the Harvard Map Collection. The selection of scanned atlases represents a range of originators and ground condition dates (1873-1916).

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  19. Title: Bromley map of South Boston, Massachusetts, 1891 : Plate 14 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of a map plate of a section of Dorchester, Massachusetts from the Bromley & Co. atlas entitled: Atlas of the City of Boston : from actual surveys and official records, by Geo. W. & Walter S. Bromley. Vol. 8 South Boston, Mass., published 1891. This image is of Plate 14 : Part of Ward 15, South Boston, city of Boston. Scale 1:600. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Massachusetts State Plane Coordinate System, Mainland Zone (in Feet) (Fipszone 2001). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. These large scale fire insurance maps typically include: building footprints, building construction material (frame, brick, stone), building assessors areas, selected owner names, selected building functions, property boundaries, building street addresses, street names, railroads, fire hydrants, water main pipelines (with size in inches), sewers, and more. Building construction material is shown by colored shading. The index plate of the atlas includes an explanation of map features. This layer is part of a selection of digitally scanned and georeferenced historic fire insurance and land ownership atlases of Boston and Cambridge, Massachusetts from the Harvard Map Collection. The selection of scanned atlases represents a range of originators and ground condition dates (1873-1916).

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  20. Title: Bromley map of South Boston, Massachusetts, 1891 : Plate 26 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of a map plate of a section of Dorchester, Massachusetts from the Bromley & Co. atlas entitled: Atlas of the City of Boston : from actual surveys and official records, by Geo. W. & Walter S. Bromley. Vol. 8 South Boston, Mass., published 1891. This image is of Plate 26 : Part of Ward 14, South Boston, city of Boston. Scale 1:600. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Massachusetts State Plane Coordinate System, Mainland Zone (in Feet) (Fipszone 2001). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. These large scale fire insurance maps typically include: building footprints, building construction material (frame, brick, stone), building assessors areas, selected owner names, selected building functions, property boundaries, building street addresses, street names, railroads, fire hydrants, water main pipelines (with size in inches), sewers, and more. Building construction material is shown by colored shading. The index plate of the atlas includes an explanation of map features. This layer is part of a selection of digitally scanned and georeferenced historic fire insurance and land ownership atlases of Boston and Cambridge, Massachusetts from the Harvard Map Collection. The selection of scanned atlases represents a range of originators and ground condition dates (1873-1916).

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