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State Library of Iowa

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House, Iowa, late 1890s or early 1900s

House, Iowa, late 1890s or early 1900s

The winding way, Iowa City, Iowa, late 1890s or early 1900s

The winding way, Iowa City, Iowa, late 1890s or early 1900s

Iowa Geological Section chart, late 1890s or early 1900s

Iowa Geological Section chart, late 1890s or early 1900s

Chart of general table of geologic divisions

Chart of general table of geologic divisions

Igneous rock classification, 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

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

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

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

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

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