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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Goldthorpe's Zinc Mine, Durango, Iowa, late 1890s or early 1900s
Sandstone interbedded with shale from Des Moines Stage at Currier's Mill, Oskaloosa, Iowa, late 1890s or early 1900s
Canyon in Sioux Quartzite, Dell Rapids, South Dakota, late 1890s or early 1900s
Diabase ledge and riffle in Split Rock Creek, Ristie's Farm, Corson, S.D., late 1890s or early 1900s
Bluffs of Kettle Creek, Millersville, Iowa, late 1890s or early 1900s
Located below Millersville.
Dakota Formation with clays and shales, Sioux Paving Brick Company, Riverside, Iowa, late 1890s or early 1900s
"The Dells" canyon in Sioux Quartzite, Dell Rapids, South Dakota, late 1890s or early 1900s
Bridge over Sioux River and Sioux Quartzite ledges, Dell Rapids, South Dakota, late 1890s or early 1900s
Bridge over Sioux River, Dell Rapids, South Dakota
Characteristic weathering of gypsum, Fort Dodge, Iowa, late 1890s or early 1900s
Cliff of Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s
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