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Collection: Calvin Geological Photographs
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Map of Iowa showing by density of pattern the relative resistances of various areas of rock to erosion, Iowa, late 1890s or early 1900s
Map of northeastern Iowa with dashed line showing locations of an old drift in patches east of margin of Kansan drift, Iowa, late 1890s or early 1900s
Old Faithful,Yellowstone National Park, late 1890s or early 1900s
Steam Laboratory
University of Iowa Campus, Iowa City
Steam Laboratory
University of Iowa Campus, Iowa City
Capitol City Brick and Pipe Company, Des Moines, Iowa, late 1890s or early 1900s
School house, Humboldt, Iowa, late 1890s or early 1900s
Aftonian gravels, Muscatine County, Iowa, late 1890s or early 1900s
Oxford Mills on the Wapsipinicon River, Oxford Mills, Iowa, late 1890s or early 1900s
Lower end of Lake Okoboji, Lake Okoboji, Iowa, late 1890s or early 1900s
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