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Collection: Calvin Geological Photographs
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Driftless area looking down into Iowa River gorge, Iowa, late 1890s or early 1900s
Drift exposed in Chicago. Minneapolis. and St. Paul Railway cut, southwest of Rhodes, Iowa, late 1890s or early 1900s
Dredge on Fraser River, Colorado, late 1890s or early 1900s
Dr. W. S. Williston, American Geologist, The University of Iowa, late 1890s or early 1900s
Dr. T.C. Chamberlin, The University of Iowa, late 1890s or early 1900s
Dome of the courthouse in Nishnabotna River valley, Atlantic, Iowa, late 1890s or early 1900s
Looking N.W. across the valley.
Dip of quartzite to the South of Court House, Sioux Falls, S.D., late 1890s or early 1800s
Diabase ledge and riffle in Split Rock Creek, Ristie's Farm, Corson, S.D., late 1890s or early 1900s
Devonian dolomite in quarry north of bridge, Forreston, Iowa, late 1890s or early 1900s
Devil's Backbone in a small driftless area, Dundee, Iowa, late 1890s or early 1900s
Located northwestern part of Delaware County, Iowa.
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