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Collection: Calvin Geological Photographs
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Topography of Iowan Drift area, Massilon Township, Iowa, July 18, 1925
Located in Massilon Twp., sections 29 and 32.
Two tills and two loesses, Iowa, June 18, 1925
Located in the west of corner of sections 20, 21, 28, and 29.
Typical development of coal measures shale in the coal pit of Iowa Pipe and Tile Works, Des Moines, Iowa, late 1890s or early 1900s
Geological Survey
Typical Kansan topography, Tipton, Iowa, late 1890s or early 1900s
Typical landscape in region covered with deep loess, near border of Iowan Drifts, Graham Township, Iowa, late 1890s or early 1900s
Unconformity between Carboniferous and Devonian, Montpelier, Iowa, late 1890s or early 1900s
Undercutting of Gower limestone on Wapsipinicon River, Massillon, Iowa, late 1890s or early 1900s
Undrained basin in Iowan Drift plain area of topographic youth near Swan Lake and surroundings, Madison Township, Iowa, late 1890s or early 1900s
Unity Hall, view from the southwest
at the corner of Clinton Street and Iowa Avenue. University of Iowa campus, Iowa City
Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s
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