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Collection: Calvin Geological Photographs
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Paha, Stanwood, Iowa, late 1890s or early 1900s
Typical Kansan topography, Tipton, Iowa, late 1890s or early 1900s
Illustration of the first lead mining in Dubuque, Iowa, 1850s
Knobby drift, Iowa, mid-1800s
Slab of Devonian limestone with long winged spirifer beds, late 1890s or early 1900s
Near Arkona.
Undrained basin in Iowan Drift plain area of topographic youth near Swan Lake and surroundings, Madison Township, Iowa, late 1890s or early 1900s
Pleistocene, loess sections, Natchez, Miss., late 1890s or early 1900s
Pleistocene, loess sections, Natchez, Miss., late 1890s or early 1900s
Pleistocene, loess sections, Natchez, Miss., late 1890s or early 1900s
Railroad cut revealing Pleistocene, loess sections, Natchez, Miss., late 1890s or early 1900s
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