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Collection: Calvin Geological Photographs
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Dredge on Fraser River, Colorado, late 1890s or early 1900s
People near cabin at ballast burning camp, Maxon, Iowa, late 1890s or early 1900s
Loading out burned clay and ballast, Davis City, Iowa, September 1897
Men on railroad cars near Iowa Ballast and Construction Co., Maxon, Iowa, late 1890s or early 1900s
Firing of the kiln, Iowa Ballast and Construction Co., Maxon, Iowa, late 1890s or early 1900s
Plant of Platt Pressed and Fire Brick Company, Van Meter, Iowa, late 1890s or early 1900s
Flint Brick Company clay pit, Des Moines, Iowa, late 1890s or early 1900s
St. Louis Limestone east of Harvey, Iowa, late 1890s or early 1900s
Cretaceous clay in drift, Coon Rapids, Iowa, late 1890s or early 1900s
Coon Rapids
Coal Measure Sandstone on Raccoon River, Iowa, late 1890s or early 1900s
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