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Collection: Calvin Geological Photographs
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Frank Leverett, George F. Kay, and Paul MacClintock in the field, Lime Springs, Iowa, July 4, 1925
Ft. Pierre Shale, Hawarden, Iowa, late 1890s or early 1900s
Near Hawarden
Galena beds located one mile below Specht's Ferry, Iowa, late 1890s or early 1900s
Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s
Galena Limestone at level of "Cap Rock", Dubuque, Iowa, late 1890s or early 1900s
Galena Limestone on the Oneota River, above Bluffton, Iowa, late 1890s or early 1900s
Gateway to the Garden of the Gods, Colorado Springs, Colo., late 1890s or early 1900s
Geological chart of Iowa in Geological Lecture room, Old Science Hall, The University of Iowa, December 13, 1899
Geological excursion at Harper's Ferry, Va., late 1890s or early 1900s
Geological excursion at Harper's Ferry, Va., late 1890s or early 1900s
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