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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Man by Illinoian Drift between two igneous deposits, Muscatine, Iowa, late 1890s or early 1900s
Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s
Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s
Man at base of hill in Webster County, Iowa, late 1890s or early 1900s
Mahoning Mine, Hibbing, Minn., late 1890s or early 1900s
Lower quarry beds, Twin Springs, Iowa, late 1890s or early 1900s
Lower end of Lake Okoboji, Lake Okoboji, Iowa, late 1890s or early 1900s
Lower end of Lake Okoboji, Lake Okoboji, Iowa, late 1890s or early 1900s
Lower coal measure limestone, Mystic, Iowa, late 1890s or early 1900s
Lower bluff beds, Specht's Ferry, Iowa, late 1890s or early 1900s
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