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Group of geodes from the Upper Keokuk, Keokuk, Iowa, late 1890s or early 1900s

Group of geodes from the Upper Keokuk, Keokuk, 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

Undrained basin in Iowan Drift plain area of topographic youth near Swan Lake and surroundings, Madison Township, Iowa, late 1890s or early 1900s

Knobby drift, Iowa, mid-1800s

Knobby drift, Iowa, mid-1800s

Typical Kansan topography, Tipton, Iowa, late 1890s or early 1900s

Typical Kansan topography, Tipton, Iowa, late 1890s or early 1900s

Paha, Stanwood, Iowa, late 1890s or early 1900s

Paha, Stanwood, 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

Valley of Little Sioux River seen from the West and the mouth of Fox Creek, Iowa, late 1890s or early 1900s

Wisconsin gravel pit, Shelby, Iowa, late 1890s or early 1900s

Wisconsin gravel pit, Shelby, Iowa, 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

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

Corals, Heliophyllum. Plate 2., late 1890s or early 1900s

Corals, Heliophyllum. Plate 2., 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