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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
The Old Mill, J.O. Strong, Propr., on a branch of Elk Creek, Iowa, late 1890s or early 1900s
The effects of geologic structure on topographic form within the driftless area. The gently undulating, lower slopes are underlain by Maquoketa Shale, the steep hills in the background are of the overlying Niagaran Limestone. Graf, Iowa, late 1890s or early 1900s
Located south from Lattner's, near Graf.
Terrill Mill on the Iowa River north of Iowa City, Iowa, September 12, 1900
Terrill Mill and Old Mill Road next to the Iowa River north of Iowa City, Iowa, late 1890s or early 1900s
Terrace of Wisconsin age near Lansing, Iowa, late 1890s or early 1900s
Team of four horses pulling a wagon of people toward the Gold Finch Mine, Mont., late 1890s or early 1900s
Surface of an alluvial fan at the foot of the Sierra Mountains in Owens Valley, Calif., late 1890s or early 1900s
Summit of Table Mound in driftless area, Dubuque, Iowa, late 1890s or early 1900s
Stream in Boulder Creek Canyon, Colo., late 1890s or early 1900s
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