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Collection: Calvin Geological Photographs
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Deposition in Cedar River at Upper Palisades, Iowa, late 1890s or early 1900s
Dells of the Wisconsin River, Wisconsin, late 1890s or early 1900s
Deep railway cut in drift, Clarinda, Iowa, late 1890s or early 1900s
Located southeast of Clarinda.
Dean G.F. Kay's car, after wind storm
Chariton, Tourist Park
Dark brownish sandstone, Lewis, Iowa, late 1890s or early 1900s
Located on the east side of the road one mile south of Lewis.
Dakota Sandstone overlain by Benton make up the falls of Fall River, S.D., late 1890s or early 1900s
Dakota Sandstone cliffs above dam on Coon River, Coon Rapids, Iowa, late 1890s or early 1900s
Dakota Formation with clays and shales, Sioux Paving Brick Company, Riverside, Iowa, late 1890s or early 1900s
Crystalline rocks overlain by stratified clastic rocks on the mountains seem from the caverns beyond Ute Pass, Manitou, Colo., late 1890s or early 1900s
Crumbling granite boulders, English Township, Iowa, June 30, 1924
Located in English Twp., middle of N.W. quarter, Section 23.
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