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Cliffs of Galena Limestone on Oneota River, Bluffton, Iowa, late 1890s or early 1900s
Cliff of Galena limestone, Durango, Iowa, late 1890s or early 1900s
Driftless area showing effects of geological structure on topography, steep escarpment is Niagara Limestone, lower gentler slopes occupied with Maquoketa Shales, Lattners, Iowa, late 1890s or early 1900s
Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s
Ledge of Trenton Limestone showing effects of weathering, late 1890s or early 1900s
Located at Twp. 96, R. W. Section 32, N. W. gr., N. W. 1/4.
Cedar Valley Stage limestone with lentincular masses included between the strata, Iowa City, Iowa, late 1890s or early 1900s
Exposure of Devonian on Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1800s
Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s
Mason City Brick and Tile Company seen from northeast, Mason City, Iowa, late 1890s or early 1900s
Quarry in Devonian Limestone, near Iron Bridge, northwest of North Liberty, Iowa, late 1890s or early 1900s
Located in Twp. 81, R. VII, Section 22
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