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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Sandstone interbedded with shale from Des Moines Stage at Currier's Mill, Oskaloosa, Iowa, late 1890s or early 1900s
Goldthorpe's Zinc Mine, Durango, Iowa, late 1890s or early 1900s
Court House on the Sioux River, Sioux Falls, S.D., late 1890s or early 1900s
Cross-bedding in Sioux Quartzite, Sioux Falls, S.D., late 1890s or early 1900s
Gravel pit with stratification in gravels, east side of Afton Junction, Iowa, late 1890s or early 1900s
Dip of quartzite to the South of Court House, Sioux Falls, S.D., late 1890s or early 1800s
Chalk cliff near Old Grills Mill on Sioux River south of Westfield, Iowa, late 1890s or early 1900s
Atwood Quarry, Iowa, late 1890s or early 1900s
Weathered face of Galena Limestone near Walter's Furnace, Dubuque, Iowa, late 1890s or early 1900s
Walter's smelter, Dubuque, Iowa, late 1890s or early 1900s
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