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Collection: Calvin Geological Photographs
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Coal at Richardson's Mine, Iowa, late 1890s or early 1900s
Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s
Glacial scorings near Kingston and Burlington, Iowa, late 1890s or early 1900s
Glacial scorings near Kingston and Burlington, Iowa, late 1890s or early 1900s
Corals, Heliophyllum. Plate 2., late 1890s or early 1900s
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
Wisconsin gravel pit, Shelby, Iowa, late 1890s or early 1900s
Valley of Little Sioux River seen from the West and the mouth of Fox Creek, Iowa, late 1890s or early 1900s
Paha, Stanwood, Iowa, late 1890s or early 1900s
Typical Kansan topography, Tipton, Iowa, late 1890s or early 1900s
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