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Steamboat Rock at "Devil's Backbone", Dundee, 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

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

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

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

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

Geological chart of Iowa in Geological Lecture room, Old Science Hall, The University of Iowa, December 13, 1899

Geological Laboratory, Old Science Hall, The University of Iowa, 1899

Geological Laboratory, Old Science Hall, The University of Iowa, 1899

Geological Laboratory, Old Science Hall, The University of Iowa, December 13, 1899

Geological Laboratory, Old Science Hall, The University of Iowa, December 13, 1899

Morainic knob, Carroll, Iowa, late 1890s or early 1900s

Morainic knob, Carroll, Iowa, late 1890s or early 1900s

West wall of "Devil's Backbone" canyon, Dundee, Iowa, late 1890s or early 1900s

West wall of "Devil's Backbone" canyon, Dundee, Iowa, late 1890s or early 1900s