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2,437 results returned

  1. Title: The south Appalachian region; by J.A. Maher & Co., 1890; compiled from the maps of the U.S. Geological Survey and other authentic sources; drawn by Jno. W. Hays; Henry S. Selden, draftsman; photo-lith. by A. Hoen & Co.

    Contributors:

    Summary: Relief shown by hachures and spot heights. 1 map: col.; 136 x 135 cm

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  2. Title: Karst hydrogeology of LeRoy Township, Mower County, Minnesota, OFR97-02

    Contributors:

    Summary: Description of the bedrock geology, karst features and depth to bedrock as it relates to hydrogeology in LeRoy Township of Mower County, Minnesota, Plate 1 Bedrock geology map (39x49 in.), Plate 2 Database and bedrock topography map (25.5x28.5 in.).

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  3. Title: Reconnaissance geologic map of Esko quadrangle, St. Louis and Carlton Counties, Minnesota, M-25

    Contributors:

    Summary: Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Esko quadrangle, scale 1:24,000.

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  4. Title: 20-Meter Grayscale Bathymetry Image (Filtered): Monterey Bay, California, 1997

    Contributors:

    Summary: This GeoTIFF is a grayscale image of the filtered 20-Meter Bathymetry Grid of Monterey Bay, California (BATHY20F). These data are available in WGS84 and UTM Zone 10 (NAD83) projections. This layer is part of the GIS Data of the Monterey Bay collection, a compilation of data and imagery of the Monterey Bay area, including coastline, imagery, and bathymetry. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This collection of data provides documented layers of of the Monterey Bay to persons/institutions of interest throughout the research and educational communities. Maher, N., Hatcher, G., and Bucciarelli, R. (1998). 20-Meter Grayscale Bathymetry Image (Filtered): Monterey Bay, California, 1997. Monterey Bay Aquarium Research Institute. Available at: http://purl.stanford.edu/kf247sf9818 All data are registered to the WGS84 datum with two versions of each feature, image, and grid coverage included in the collection. One is in a Geographic (decimal degrees) coordinate system and the second is in a Universal Transverse Mercator (UTM) zone 10 projection. For strict accuracy and hard-copy production requiring feature, grid, and/or image data, the UTM projection coverages should be used. In fact, some ArcView functions will not be available unless the data are displayed in a projection. This is because a Geographic Coordinate System is NOT a projection but rather a spherical coordinate system dealing directly in latitude and longitude. However, at the scale of maps covering Monterey Bay, the errors produced by ignoring this fact are small. NOTE: To most easily use the grid data, the ArcView Spatial Analyst extension should be installed on your system.

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  5. Title: Merged Bathymetric and Topographic Elevation Image: Monterey Bay, California, 1998

    Contributors:

    Summary: This GeoTIFF image represents merged bathymetric and topographic elevation data collected in Monterey Bay, California. Data used to generate this image include: bathy20f grid, a modified seafloor elevation map, and a 30m DEM grid. This GeoTIFF is available in WGS84 and UTM Zone 10 (NAD83) projections. This layer is part of the GIS Data of the Monterey Bay collection, a compilation of data and imagery of the Monterey Bay area, including coastline, imagery, and bathymetry. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This collection of data provides documented layers of of the Monterey Bay to persons/institutions of interest throughout the research and educational communities. Hatcher, G., Maher, N. and Bucciarelli, R. (1998). Merged Bathymetric and Topographic Elevation Image: Monterey Bay, California, 1998. Monterey Bay Aquarium Research Institute. Available at: http://purl.stanford.edu/sv608yk8265 All data are registered to the WGS84 datum with two versions of each feature, image, and grid coverage included in the collection. One is in a Geographic (decimal degrees) coordinate system and the second is in a Universal Transverse Mercator (UTM) zone 10 projection. For strict accuracy and hard-copy production requiring feature, grid, and/or image data, the UTM projection coverages should be used. In fact, some ArcView functions will not be available unless the data are displayed in a projection. This is because a Geographic Coordinate System is NOT a projection but rather a spherical coordinate system dealing directly in latitude and longitude. However, at the scale of maps covering Monterey Bay, the errors produced by ignoring this fact are small. NOTE: To most easily use the grid data, the ArcView Spatial Analyst extension should be installed on your system.

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  6. Title: Fault Lines: Monterey Bay, California, 1994

    Contributors:

    Summary: This line shapefile shows the estimated major fault lines in Monterey Bay, California. These data were digitized from "Fault Activity Map of California and Adjacent Areas" (1994) and "Geology of the Central California Continental Margin" (1989). Shapefiles for this layer are available in WGS84 and UTM Zone 10 (NAD83) projections. This layer is part of the GIS Data of the Monterey Bay collection, a compilation of data and imagery of the Monterey Bay area, including coastline, imagery, and bathymetry. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This collection of data provides documented layers of of the Monterey Bay to persons/institutions of interest throughout the research and educational communities. Maher, N. (1998). Fault Lines: Monterey Bay, California, 1992. Monterey Bay Aquarium Research Institute Available at: http://purl.stanford.edu/zy533xk5367 All data are registered to the WGS84 datum with two versions of each feature, image, and grid coverage included in the collection. One is in a Geographic (decimal degrees) coordinate system and the second is in a Universal Transverse Mercator (UTM) zone 10 projection. For strict accuracy and hard-copy production requiring feature, grid, and/or image data, the UTM projection coverages should be used. In fact, some ArcView functions will not be available unless the data are displayed in a projection. This is because a Geographic Coordinate System is NOT a projection but rather a spherical coordinate system dealing directly in latitude and longitude. However, at the scale of maps covering Monterey Bay, the errors produced by ignoring this fact are small.

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  7. Title: Sidescan Sonar Image of Monterey Canyon, 1997

    Contributors:

    Summary: This GeoTIFF is a sidescan sonar image of Monterey Canyon in Monterey Bay, California, at (approx.) 7 meter/pixel resolution. Original data were collected by MSSS-1 side scan sonar at 30 Khz with a swath width of 3-5 km. These data are available in GCS WGS 84 and UTM Zone 10 (NAD 83) projections. This layer is part of the GIS Data of the Monterey Bay collection, a compilation of data and imagery of the Monterey Bay area, including coastline, imagery, and bathymetry. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This collection of data provides documented layers of of the Monterey Bay to persons/institutions of interest throughout the research and educational communities. Maher, N. (1998) Sidescan Sonar Image of Monterey Canyon, 1997. Monterey Bay Aquarium Research Institute. Available at: http://purl.stanford.edu/pb105dx2119 All data are registered to the WGS84 datum with two versions of each feature, image, and grid coverage included in the collection. One is in a Geographic (decimal degrees) coordinate system and the second is in a Universal Transverse Mercator (UTM) zone 10 projection. For strict accuracy and hard-copy production requiring feature, grid, and/or image data, the UTM projection coverages should be used. In fact, some ArcView functions will not be available unless the data are displayed in a projection. This is because a Geographic Coordinate System is NOT a projection but rather a spherical coordinate system dealing directly in latitude and longitude. However, at the scale of maps covering Monterey Bay, the errors produced by ignoring this fact are small. NOTE: To most easily use the grid data, the ArcView Spatial Analyst extension should be installed on your system.

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  8. Title: Merged Landsat and Shaded Bathymetry Image: Monterey Bay, California,1996

    Contributors:

    Summary: This GeoTIFF image represents merged Landsat and shaded bathymetry data collected from Monterey Bay, California. This layer was created in January of 1996. Source data includes: raw Seabeam bathymetry data, hydrographic data and Landsat imagery. These data are available in WGS84 and UTM Zone 10 (NAD83) projections. This layer is part of the GIS Data of the Monterey Bay collection, a compilation of data and imagery of the Monterey Bay area, including coastline, imagery, and bathymetry. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This collection of data provides documented layers of of the Monterey Bay to persons/institutions of interest throughout the research and educational communities. Maher, N. (1998). Merged Landsat and Shaded Bathymetry Image: Monterey Bay, California, 1996. Monterey Bay Aquarium Research Institute. Available at: http://purl.stanford.edu/hz959ms7411 All data are registered to the WGS84 datum with two versions of each feature, image, and grid coverage included in the collection. One is in a Geographic (decimal degrees) coordinate system and the second is in a Universal Transverse Mercator (UTM) zone 10 projection. For strict accuracy and hard-copy production requiring feature, grid, and/or image data, the UTM projection coverages should be used. In fact, some ArcView functions will not be available unless the data are displayed in a projection. This is because a Geographic Coordinate System is NOT a projection but rather a spherical coordinate system dealing directly in latitude and longitude. However, at the scale of maps covering Monterey Bay, the errors produced by ignoring this fact are small. NOTE: To most easily use the grid data, the ArcView Spatial Analyst extension should be installed on your system.

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  9. Title: Geologic Map: Monterey Bay, California, 1990

    Contributors:

    Summary: This GeoTIFF image shows the Monterey Bay section of the "Geology of the Central California Continental Margin" map, originally published in 1989 by the California Division of Mines and Geology. These data are provided in WGS84 and UTM Zone 10 (NAD83) projections. This layer is part of the GIS Data of the Monterey Bay collection, a compilation of data and imagery of the Monterey Bay area, including coastline, imagery, and bathymetry. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This collection of data provides documented layers of of the Monterey Bay to persons/institutions of interest throughout the research and educational communities. Maher, N. (1998). Geologic Map: Monterey Bay, California, 1990. Monterey Bay Aquarium Research Institute. Available at: http://purl.stanford.edu/tr787rb6145 All data are registered to the WGS84 datum with two versions of each feature, image, and grid coverage included in the collection. One is in a Geographic (decimal degrees) coordinate system and the second is in a Universal Transverse Mercator (UTM) zone 10 projection. For strict accuracy and hard-copy production requiring feature, grid, and/or image data, the UTM projection coverages should be used. In fact, some ArcView functions will not be available unless the data are displayed in a projection. This is because a Geographic Coordinate System is NOT a projection but rather a spherical coordinate system dealing directly in latitude and longitude. However, at the scale of maps covering Monterey Bay, the errors produced by ignoring this fact are small. NOTE: To most easily use the grid data, the ArcView Spatial Analyst extension should be installed on your system.

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  10. Title: Sidescan Sonar Image Collected from the San Gregorio Fault Zone, California, 1997

    Contributors:

    Summary: This GeoTIFF is a sidescan sonar image of 'Chimney Field' area on the San Gregorio fault zone. The San Gregorio Fault is an active earthquake fault located off the coast of Northern California. The Chimney field area is located on the upper northern flank of Sur Ridge. These data are available in GCS WGS 84 and UTM Zone 10 (NAD 83) projections. This layer is part of the GIS Data of the Monterey Bay collection, a compilation of data and imagery of the Monterey Bay area, including coastline, imagery, and bathymetry. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This collection of data provides documented layers of of the Monterey Bay to persons/institutions of interest throughout the research and educational communities. Maher, N. (1998). Sidescan Sonar Image Collected from the San Gregorio Fault Zone, California, 1997. Monterey Bay Aquarium Research Institute. Available at: http://purl.stanford.edu/rm945zy8047 All data are registered to the WGS84 datum with two versions of each feature, image, and grid coverage included in the collection. One is in a Geographic (decimal degrees) coordinate system and the second is in a Universal Transverse Mercator (UTM) zone 10 projection. For strict accuracy and hard-copy production requiring feature, grid, and/or image data, the UTM projection coverages should be used. In fact, some ArcView functions will not be available unless the data are displayed in a projection. This is because a Geographic Coordinate System is NOT a projection but rather a spherical coordinate system dealing directly in latitude and longitude. However, at the scale of maps covering Monterey Bay, the errors produced by ignoring this fact are small. NOTE: To most easily use the grid data, the ArcView Spatial Analyst extension should be installed on your system.

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  11. Title: Merged Bathymetric and Slant Aperture Radar Image: Monterey Bay, California, 1996

    Contributors:

    Summary: This GeoTIFF represents merged bathymetric data and Slant Apperture Radar imagery. This layer was created in January, 1996. These data are available in WGS84 and UTM Zone 10 (NAD83) projections. This layer is part of the GIS Data of the Monterey Bay collection, a compilation of data and imagery of the Monterey Bay area, including coastline, imagery, and bathymetry. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This collection of data provides documented layers of of the Monterey Bay to persons/institutions of interest throughout the research and educational communities. Maher, N (1998). Merged Bathymetric and Slant Aperture Radar Image: Monterey Bay, California, 1996. Monterey Bay Aquarium Research Institute. Available at: http://purl.stanford.edu/gq629rb6099 All data are registered to the WGS84 datum with two versions of each feature, image, and grid coverage included in the collection. One is in a Geographic (decimal degrees) coordinate system and the second is in a Universal Transverse Mercator (UTM) zone 10 projection. For strict accuracy and hard-copy production requiring feature, grid, and/or image data, the UTM projection coverages should be used. In fact, some ArcView functions will not be available unless the data are displayed in a projection. This is because a Geographic Coordinate System is NOT a projection but rather a spherical coordinate system dealing directly in latitude and longitude. However, at the scale of maps covering Monterey Bay, the errors produced by ignoring this fact are small. NOTE: To most easily use the grid data, the ArcView Spatial Analyst extension should be installed on your system.

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  12. Title: World (Petroleum Fields, 2003)

    • Point data
    • 2003
    Contributors:

    Summary: This shapefile includes arcs and polygons that describeU.S. Geological Survey delineatedTotal Petroleum Systems of the World. Each petroleum systemis defined as a mappable entity encompassing geneticallyrelated petroleum that occurs in seeps, shows and accumulations(discovered or undiscovered) that have been generated by a pod,or by closely related pods, of mature source rock, together withthe essental mappable geologic elements (source, reservoir, sealand overburden rocks) that control fundamental processes ofgeneration, migration, entrapment and preservation of petroleum.Total petroleum systems are described by U.S. Geological Surveyscientists on the basis of exploration and production histories,and extensive literature searches. Total petroleum systems areidentified with a numeric code derived from the numeric codeof the World Geologic Provinces as defined by theU.S. Geological Survey World Energy Project. Most totalpetroleum systems are contained within a single geologicprovince, but there are numerous cases where systemsspan more than one province. Summary results of the assessmentare presented as attributes of this shapefile.

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  13. Title: Ireland & Northern Ireland, 1855 (Image 2 of 4) (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: A general map of Ireland to accompany the report of the Railway Commissioners : shewing the principal physical features and geological structure of the country, constructed in 1836 and engraved in 1837-38. It was published by Hodges & Smith in 1855. Scale [1: 253,440]. One inch to four statute miles. This layer is image 2 of 4 total images of the 4 sheet source map, representing the northeast portion of the map.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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. This map shows features such as drainage, cities and other human settlements, roads, railroads, administrative boundaries, geology, shoreline features, and more. Relief shown by hachures and spot heights, depths shown by soundings. Includes also notes and 9 cross sections.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

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  14. Title: Ireland & Northern Ireland, 1855 (Image 3 of 4) (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: A general map of Ireland to accompany the report of the Railway Commissioners : shewing the principal physical features and geological structure of the country, constructed in 1836 and engraved in 1837-38. It was published by Hodges & Smith in 1855. Scale [1: 253,440]. One inch to four statute miles. This layer is image 3 of 4 total images of the 4 sheet source map, representing the southwest portion of the map.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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. This map shows features such as drainage, cities and other human settlements, roads, railroads, administrative boundaries, geology, shoreline features, and more. Relief shown by hachures and spot heights, depths shown by soundings. Includes also notes and 9 cross sections.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

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  15. Title: Ireland & Northern Ireland, 1855 (Image 1 of 4) (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: A general map of Ireland to accompany the report of the Railway Commissioners : shewing the principal physical features and geological structure of the country, constructed in 1836 and engraved in 1837-38. It was published by Hodges & Smith in 1855. Scale [1: 253,440]. One inch to four statute miles. This layer is image 1 of 4 total images of the 4 sheet source map, representing the northwest portion of the map.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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. This map shows features such as drainage, cities and other human settlements, roads, railroads, administrative boundaries, geology, shoreline features, and more. Relief shown by hachures and spot heights, depths shown by soundings. Includes also notes and 9 cross sections.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

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  16. Title: Ireland & Northern Ireland, 1855 (Image 4 of 4) (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: A general map of Ireland to accompany the report of the Railway Commissioners : shewing the principal physical features and geological structure of the country, constructed in 1836 and engraved in 1837-38. It was published by Hodges & Smith in 1855. Scale [1: 253,440]. One inch to four statute miles. This layer is image 4 of 4 total images of the 4 sheet source map, representing the southeast portion of the map.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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. This map shows features such as drainage, cities and other human settlements, roads, railroads, administrative boundaries, geology, shoreline features, and more. Relief shown by hachures and spot heights, depths shown by soundings. Includes also notes and 9 cross sections.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

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  17. Title: Newton, Massachusetts, 1855 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: Map of the town of Newton, Middlesex County, Mass., surveyed by order of the town by H.F. Walling, Sup. of the state map; assistant engineers F.S. Belden, N. Smith, Jr. It was published by Lith of Sarony & Co. in 1855. Scale [1:12,900]. 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. This map shows features such as roads, railroads and stations, drainage, public buildings, schools, industry locations (e.g. mills, factories, etc.), selected private buildings with names of property owners, town boundaries, cemeteries, and more. Relief shown by hachures. Includes insets: West Newton -- Newton Corner.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

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  18. Title: San Francisco, California, 1863 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: Map of the City & County of San Francisco : carefully compiled from recent surveys, including all new additions of cities, towns, and villas, delineating the lines of ranchos, private claims water works, railroads, &c. &c., drawn for the San Francisco News Letter and the Pacific Mining Journal by James Butler. It was published by Britton & Co. in 1863. Scale [1:15,840].The image inside the map neatline is georeferenced to the surface of the earth and fit to the California State Plane NAD 1983 coordinate system (Zone III) (in Feet) (Fipszone 0403). 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. This map shows features such as roads, railroads, drainage, shoreline features, property lots, numbers and landowner names, reserved government properties, ranchos, city boundaries, cemeteries, water works, and more.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

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  19. Title: Japan, 1880 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: Nippon (Japan), 1880 : compiled from native maps and the notes of recent travellers, by R. Henry Brunton. It was published by Trubner and co. in 1880. Scale [ca. 1:558,800].The image inside the map neatline is georeferenced to the surface of the earth and fit to the Asia North Lambert Conformal Conic coordinate system. 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. This map shows features such as drainage, cities and other human settlements, administrative boundaries, roads, railroads, ferry routes, telegraph lines, shoreline features, and more. Relief shown by hachures. Relief shown by hachures. Includes statistical and informational tables and 2 insets: 'Yezo and Chishima', 'Yayeyama and Riukiu islands'.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

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  20. Title: China, North Korea, and South Korea, 1808 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: China, Neele sculpt. It was published by Longman & Co, Paternoster Row in Jany. 1, 1808. Scale [ca. 1:9,600,000]. Covers East and Central China, and North and South Korea, and a small portion of Mongolia, Vietnam, Laos, Burma, India, Japan, and Russia. Map in French and Dutch. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Asia North Lambert Conformal Conic coordinate system. 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. This map shows features such as drainage, cities and other human settlements, territorial boundaries, shoreline features, and more.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

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