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Pleistocene Fauna, horse teeth and superior molars, Cox Pit, Missouri Valley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, horse teeth and superior molars, Cox Pit, Missouri Valley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, 1) horn core from Cox Pit (Harrison Co.), 2) Elephas primigenius, Denison Pit (Crawford Co.), Iowa, late 1890s or early 1900s

Pleistocene Fauna, 1) horn core from Cox Pit (Harrison Co.), 2) Elephas primigenius, Denison Pit (Crawford Co.), Iowa, late 1890s or early 1900s

Pleistocene Fauna, side of molars of Equus scotti Gidley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, side of molars of Equus scotti Gidley, Iowa, late 1890s or early 1900s

Pleistocene Fauna horse teeth (mammals), Iowa, late 1890s or early 1900s

Pleistocene Fauna horse teeth (mammals), Iowa, late 1890s or early 1900s

Pleistocene Fauna, late 1890s or early 1900s

Pleistocene Fauna, late 1890s or early 1900s

Deep railway cut in drift, Clarinda, Iowa, late 1890s or early 1900s

Deep railway cut in drift, Clarinda, Iowa, late 1890s or early 1900s

Located southeast of Clarinda.

Lower end of Lake Okoboji, Lake Okoboji, Iowa, late 1890s or early 1900s

Lower end of Lake Okoboji, Lake Okoboji, 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

Initial steps in the formation of gulches in loess, section 20, Graham Township, Iowa, late 1890s or early 1900s

Forest meets the prairie on William Brook's farm in Brookes Township, Iowa, late 1890s or early 1900s

Forest meets the prairie on William Brook's farm in Brookes Township, 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