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Collection: Calvin Geological Photographs
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Coal at Richardson's Mine, Iowa, late 1890s or early 1900s
Coal Measure Sandstone and shale at foot of Capitol Hill, Des Moines, Iowa, late 1890s or early 1900s
Coal Measure Sandstone on Raccoon River, Iowa, late 1890s or early 1900s
Coal Measure Shale (middle of picture) resting in eroded channel in St. Louis sandstone (seen in lower corners of picture) on Cedar Creek, Bellefontaine, Iowa, late 1890s or early 1900s.
Coal Measure Shale, Fort Dodge, Iowa, late 1890s or early 1900s
Cold Hollow and Palisades at the entrance on the Cedar River, Mount Vernon, Iowa, late 1890s or early 1900s
Columns of St. Croix sandstone, Iowa, late 1890s or early 1900s
Located on Lane's Farm, Twp. 100, NR. IV, Section 31, N.W. gr., N.W. 1/4.
Company house at base of Porphyry Mountain, Colorado, late 1890s or early 1900s
Complete ideal section of the Nebraskan and Kansan Drifts, 1925
Compound fold of Lower Cambrian on top of Boardman Hill, Rutland, Vt., late 1890s or early 1900s
The hammer is 15 1/2 inches long.
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