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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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The winding way, Iowa City, Iowa, late 1890s or early 1900s
Igneous rock classification, late 1890s or early 1900s
Map of currents of glaciers in the neighborhood of the driftless area, late 1890s or early 1900s
Folding and crumpling of the Pierre Shales used by the cement company, Yankton, S.D., late 1890s or early 1900s
Exfoliating granite at Marklesville quadrangle at the summit of the Sierra Nevada, California, late 1890s or early 1900s
Pebble analyses of the Kansas and Nebraska drifts, late 1890s or early 1900s
Effects of expansion of ice along margin of Clear Lake, Clear Lake, Iowa, late 1890s or early 1900s
Peat and forest bed of Sangamon, interglacial interval, underlain by Illinoian Drift, overlain by Iowan loess and Wisconsin Drift east of Peoria, Ill., late 1890s or early 1900s
Section of drift deposits west of Muscatine, Iowa, late 1890s or early 1900s
Boulder field, Newton Township, Iowa, late 1890s or early 1900s
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