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Collection: Calvin Geological Photographs
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Sontty Hills, Delhi Township, south of Earlville, Iowa, late 1890s or early 1900s
Bluff next to the Maquoketa River on the eastern side of "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
People on the back of Saunder's Creek, Iowa, late 1890s or early 1900s
Oxford Mills on the Wapsipinicon River, Oxford Mills, Iowa, late 1890s or early 1900s
Steamboat Rock at "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
Man standing at top of waterfall in Devil's Den, Iowa, late 1890's or early 1900s
"Devil's Den" located at Twp. 99, R. V, Section 19, N.W. gr., N.E. 1/4, N.E. corner.
East wall of "The Mound", north of Luverne, Minn., late 1890s or early 1900s
Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s
Located in section 20 of Graham Township.
Botanical Laboratory, south room, Old Science Hall
Old Science Hall on the University of Iowa campus, Iowa City
Geological chart of Iowa in Geological Lecture room, Old Science Hall, The University of Iowa, December 13, 1899
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