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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.
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, December 13, 1899
Morainic knob, Carroll, Iowa, late 1890s or early 1900s
West wall of "Devil's Backbone" canyon, Dundee, Iowa, late 1890s or early 1900s
Cliffs, Clay Mill, Iowa, late 1890s or early 1900s
Photograph taken from Mill.
Thin bedded Niagara and flagstone beds of Syringopora tenella zones in the upper cliffs, Jefferson Township, Balltown, Iowa, late 1890s or early 1900s
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