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Atwood Quarry, Iowa, late 1890s or early 1900s
People with horse and cart at base of eroded surface of gypsum beds, Fort Dodge, Iowa, late 1890s or early 1900s
Cross-bedding in coal measure sandstone, Red Rock, Iowa, late 1890s or early 1900s
Crest of redrock sandstone near west end of quarry, Red Rock, Iowa, late 1890s or early 1900s
Base of Redrock Bluff at the east end of Redrock Quarry, Iowa, late 1890s or early 1900s
Quarry in Upper Coal Measures, old workings showing separation of stone into ledges, Earlham, Iowa, late 1890s or early 1900s
New workings in quarry in Upper Coal Measures, Earlham, Iowa, late 1890s or early 1900s
Man standing in cut for the foundation of women's gymnasium shows Loess overlying Buchanan Gravels, The University of 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
Lime quarry, Cedar Valley, Iowa, late 1890s or early 1900s
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