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Collection: Calvin Geological Photographs
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Knobby drift, Iowa, mid-1800s
Undrained basin in Iowan Drift plain area of topographic youth near Swan Lake and surroundings, Madison Township, Iowa, late 1890s or early 1900s
Group of geodes from the Upper Keokuk, Keokuk, Iowa, late 1890s or early 1900s
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
Bridge over Coon Rapids, Middle Raccoon River, Coon Rapids, Iowa, late 1890s or early 1900s
Group photo from the International Geological Conference, Canada, 1913
People on the back of Saunder's Creek, Iowa, late 1890s or early 1900s
American Association of Geographers Davis Excursion, St. Paul, Minn., 1912
President I. J. Griswold home, Winthrop, Iowa, late 1890s or early 1900s
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