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Collection: Calvin Geological Photographs
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Kansan gumbotil, Lincoln Township, Iowa, June 21, 1925
Located in Lincoln Twp., SW 1/4, section 11.
Lightening flashes in a storm, Fairmont Park, Council Bluffs, Iowa, July 07, 1925
Lower coal measure limestone, Mystic, Iowa, late 1890s or early 1900s
Railroad car at Mystic Coal mine, Mystic, Iowa, late 1890s or early 1900s
Coal at Richardson's Mine, Iowa, late 1890s or early 1900s
Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s
Geology Club, The University of Iowa, January 26, 1942
Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s
Located in Twp. 95, R.V. Section 34, S.W. gr. N.W. 1/4.
Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s
Located in Twp. 99, R.V. Section I, N.W. gr.
Oneota River near Bluffton, Iowa, late 1890s or early 1900s.
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