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Collection: Calvin Geological Photographs
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Pleistocene, loess sections, Natchez, Miss., late 1890s or early 1900s
Pleistocene, loess sections, Natchez, Miss., 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
Slab of Devonian limestone with long winged spirifer beds, late 1890s or early 1900s
Near Arkona.
Knobby drift, Iowa, mid-1800s
Illustration of the first lead mining in Dubuque, Iowa, 1850s
Typical Kansan topography, Tipton, Iowa, late 1890s or early 1900s
Paha, Stanwood, Iowa, late 1890s or early 1900s
Terrill Mill and Old Mill Road next to the Iowa River north of Iowa City, Iowa, late 1890s or early 1900s
Terrill Mill on the Iowa River north of Iowa City, Iowa, September 12, 1900
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