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1. Title: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 4

   • Not specified
   • 1918
   • Not owned by MIT (Owned by University of Minnesota)

   Contributors:

   • Harder, E.C.
   • Johnston, A. W. (A. Walfred)

   Summary: Map and sections showing the geology and workings of the Pennington, Armour No. 1, and Armour No. 2 Mines, Cuyuna Iron-ore District, Minnesota, surveyed in July, 1915, scale 1 inch = about 130 miles.

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2. Title: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 1

   • Not specified
   • 1918
   • Not owned by MIT (Owned by University of Minnesota)

   Contributors:

   • Harder, E.C.
   • Johnston, A. W. (A. Walfred)

   Summary: Map of East Central Minnesota showing location of rock outcrops (location of rocks exposed at the land surface), scale 1 inch = 10 miles.

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3. Title: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 2

   • Not specified
   • 1918
   • Not owned by MIT (Owned by University of Minnesota)

   Contributors:

   • Harder, E.C.
   • Johnston, A. W. (A. Walfred)

   Summary: Map of the principal part of the Cuyuna Iron-ore District, showing the distribution of known iron-bearing rocks and lines of maximum magnetic attraction, scale 1 inch = 1 mile.

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4. Title: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 5

   • Not specified
   • 1918
   • Not owned by MIT (Owned by University of Minnesota)

   Contributors:

   • Harder, E.C.
   • Johnston, A. W. (A. Walfred)

   Summary: Map and sections showing the geology and workings of the Thompson Mine, Cuyuna Iron-ore District, surveyed July, 1915, scale 1 inch = 130 miles.

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5. Title: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 3

   • Not specified
   • 1918
   • Not owned by MIT (Owned by University of Minnesota)

   Contributors:

   • Harder, E.C.
   • Johnston, A. W. (A. Walfred)

   Summary: Map and sections showing the geology and workings of the Rowe Mine, Cuyuna Iron-ore District, surveyed in July, 1915, scale 1 inch = about 130 feet.

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6. Title: Sectional map of Koochiching County, Minnesota, 1912

   • Not specified
   • 1912
   • Not owned by MIT (Owned by University of Minnesota)

   Contributors:

   • E.C. Bridgman Maps (Firm)
   • Ogaard, Louis A.

   Summary: Cartographic Details: Scale approximately 1:120,000 (W 94°27'--W 93°03'/N 48°45'--N 47°49'). 86 x 92 centimeters Scale approximately 1:120,000 Minnesota County Maps, Plat Books, and Atlases

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