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Collection: Calvin Geological Photographs
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Mineral cases in Geological Laboratory, Old Science Hall, The University of Iowa, December 13, 1899
Mineral Creek valley cut in Oneota limestone, Iowa, late 1890s or early 1900s
Located in Twp. 99, R. VI, Section 14.
Mississippi Bluff with Saint Croix at base (300 ft.) and 100 feet Oneota above, Lansing, Iowa, late 1890s or early 1900s
Fourth bluff below.
Missouri River and flood plain with Missouri and South Dakota bluffs seen from the Nebraska side of the river, Yankton, S.D., late 1890s or early 1900s
Model of anthracite coal formations and methods of mining, Pennsylvania, late 1890s or early 1900s
Moline quarry on Shakerag Creek north of Le Claire, Iowa, late 1890s or early 1900s
Monadnock east of Almoral, Iowa, late 1890s or early 1900s
Monument of Niagaran limestone a few miles west of Keystone Mills, Iowa, late 1890s or early 1900s
Moraine northwest of Swaledale, Iowa, late 1890s or early 1900s
Moraine on Wisconsin Drift, Iowa, late 1890s or early 1900s
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