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Collection: Calvin Geological Photographs
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Railway cut, Oelwein, Iowa, late 1890s or early 1900s
Railway cut showing Aftonian soil and plant bed between Pre-Kansan and Kansan drift, Tama County, Iowa, late 1890s or early 1900s
Railway cut showing Aftonian peat bed overlain by Kansan drift, Oelwein, Iowa, late 1890s or early 1900s
Railroad flat cars in J. C. Gravel Pit, Independence, Iowa, late 1890s or early 1900s
Railroad cut through Maquoketa Shales, Graf, Iowa, late 1890s or early 1900s
Located north of Graf.
Railroad cut revealing Pleistocene, loess sections, Natchez, Miss., late 1890s or early 1900s
Railroad cars at Iowa Ballast Construction Co., Maxon, Iowa, late 1890s or early 1900s
Railroad car at Mystic Coal mine, Mystic, Iowa, late 1890s or early 1900s
Railroad along stream in Boulder Creek Canyon, Colo., late 1890s or early 1900s
Raccoon River Valley, south of Carrollton, Iowa, late 1890s or early 1900s
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