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Lower coal measure limestone, Mystic, Iowa, late 1890s or early 1900s

Lower coal measure limestone, Mystic, Iowa, late 1890s or early 1900s

Railroad car at Mystic Coal mine, Mystic, Iowa, late 1890s or early 1900s

Railroad car at Mystic Coal mine, Mystic, Iowa, late 1890s or early 1900s

Coal at Richardson's Mine, Iowa, late 1890s or early 1900s

Coal at Richardson's Mine, Iowa, late 1890s or early 1900s

Upper Coal Measure Limestone, Earlham, 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

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

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

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

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

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