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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Illinoian gumbotil plain, Fort Madison, Iowa, June 21, 1924
Located in Washington Twp., S.E. quarter Section 33. Photographed from the edge of bluffs above Fort Madison.
Illustration of the first lead mining in Dubuque, Iowa, 1850s
Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s
Located in section 20 of Graham Township.
Initial steps in the formation of gulches in loess, section 20, Graham Township, Iowa, late 1890s or early 1900s
Interurban cut west of the Iowa River, Iowa City, Iowa, 1917
Interurban cut west of the Iowa River, Iowa City, Iowa, 1917
Interurban cut with University of Iowa buildings visible on the other side of the river, Iowa City, Iowa, late 1890s or early 1900s
Iowa Geological Section chart, late 1890s or early 1900s
Iowa Pipe and Tile Works, Des Moines, Iowa, late 1890s or early 1900s
Iowa River and bluff above Turkey Creek, Iowa City, Iowa, late 1890s or early 1900s
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