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Man by Illinoian Drift between two igneous deposits, Muscatine, Iowa, late 1890s or early 1900s

Man by Illinoian Drift between two igneous deposits, Muscatine, Iowa, late 1890s or early 1900s

Cedar River from top of Old McCune Quarry, Cedar Township, Iowa, late 1890s or early 1900s

Cedar River from top of Old McCune Quarry, Cedar Township, Iowa, late 1890s or early 1900s

Boulder field, Newton Township, Iowa, late 1890s or early 1900s

Boulder field, Newton Township, Iowa, late 1890s or early 1900s

Section of drift deposits west of Muscatine, Iowa, late 1890s or early 1900s

Section of drift deposits west of Muscatine, 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

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

Effects of expansion of ice along margin of Clear Lake, Clear Lake, Iowa, late 1890s or early 1900s

Effects of expansion of ice along margin of Clear Lake, Clear Lake, Iowa, late 1890s or early 1900s

Pebble analyses of the Kansas and Nebraska drifts, late 1890s or early 1900s

Pebble analyses of the Kansas and Nebraska drifts, late 1890s or early 1900s

Exfoliating granite at Marklesville quadrangle at the summit of the Sierra Nevada, California, late 1890s or early 1900s

Exfoliating granite at Marklesville quadrangle at the summit of the Sierra Nevada, California, 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

Folding and crumpling of the Pierre Shales used by the cement company, Yankton, S.D., late 1890s or early 1900s

Map of currents of glaciers in the neighborhood of the driftless area, late 1890s or early 1900s

Map of currents of glaciers in the neighborhood of the driftless area, late 1890s or early 1900s