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Collection: Calvin Geological Photographs
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Iowan geologist J.T. Lonsdale, Iowa, late 1890s or early 1900s
A.C. Trowbridge, Professor of Geology, The University of Iowa, late 1890s or early 1900s
Farming conditions on drift plain, Stockton, Ill., late 1890s or early 1900s
Farming conditions on drift plain, Stockton, Ill., late 1890s or early 1900s
Forest meets the prairie on William Brook's farm in Brookes Township, Iowa, late 1890s or early 1900s
Initial steps in the formation of gulches in loess, section 20, Graham Township, Iowa, late 1890s or early 1900s
Lower end of Lake Okoboji, Lake Okoboji, Iowa, late 1890s or early 1900s
Deep railway cut in drift, Clarinda, Iowa, late 1890s or early 1900s
Located southeast of Clarinda.
Pleistocene Fauna, late 1890s or early 1900s
Pleistocene Fauna horse teeth (mammals), Iowa, late 1890s or early 1900s
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