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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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People near cabin at ballast burning camp, Maxon, Iowa, late 1890s or early 1900s
People at residence of Payne and Arnold near Minnekahta, S.D., late 1890s and early 1900s
Pekay Mine, Pekay, Iowa, late 1890s or early 1900s
Southwestern view.
Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924
Located in the middle of line between Sections 1 and 2 in Fremont Township.
Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924
Located in the middle of line between Sections 1 and 2 in Fremont Township.
Pebble band in Iowan till, Liberty Township, Iowa, July 4, 1925
Located in the west side of section 7 of Liberty Township.
Pebble analyses of the Kansas and Nebraska drifts, late 1890s or early 1900s
Peat and forest bed of Sangamon, interglacial interval, underlain by Illinoian Drift, overlain by Iowan loess and Wisconsin Drift east of Peoria, Ill., late 1890s or early 1900s
Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s
Part of the "Oyster Shell Rim" of hard limestone with shells of Inoceramus, Fall River, S.D., late 1890s or early 1900s
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