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Collection: Calvin Geological Photographs
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The Sentinel and Sleeping Boulders, Newton Township, Iowa, late 1890s or early 1900s
Buchanan gravels, vertical view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s
Heaving of ice along margin of Clear Lake, Iowa, late 1890s or early 1900s
Glacial markings, Burlington, Iowa, late 1890s or early 1900s
Buchanan Gravels, Earlville, Iowa, late 1890s or early 1900s
Sand Pit at the upper Palisades, Mount Vernon, Iowa, late 1890s or early 1900s
Beds, Peoria, Ill., late 1890s or early 1900s
Located east of Peoria, Ill.
Boulders from the marginal moraine of the Wisconsin Drift Sheet, Clear Lake, Iowa, late 1890s or early 1900s
Loess and Kansan topography west of Belle Plaine, Iowa, late 1890s or early 1900s
Wisconsin gravel pit, Peoria, Ill., late 1890s or early 1900s
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