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Collection: Calvin Geological Photographs
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Elk Creek and Elk Mountain, Iowa, late 1890s or early 1900s
Engineers working on a mountain side, late 1890s or early 1900s
Engineers working on mountain, late 1890s or early 1900s
Erosion and Huronian glaciation of Split Rock Creek, Palisades, S.D., late 1890s or early 1900s
Erosion and Huronian glaciation of Split Rock Creek, Palisades, S.D., late 1890s or early 1900s
Erosion in till and loess, Cass Township, Iowa, July 18, 1924
Located in Cass Twp., middle of north line of south section 6, just west of Panora.
Estes Park from verandah of Estes Park Hotel, Estes Park, Colorado, late 1890s or early 1900s
Exfoliating granite at Marklesville quadrangle at the summit of the Sierra Nevada, California, late 1890s or early 1900s
Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s
Exposure of Devonian on Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1800s
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