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Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1900s
Cliff of Carboniferous sandstone on Pine Creek in Wild Cat Den State Park, Iowa, 1889
Maquoketa River and east side of ""Devil's Backbone,"" with a ridge of Niagaran Limestone, Dundee, Iowa, late 1890s or early 1900s.
Located in Twp. 90, R. VI, Section 16.
Maquoketa River and pine covered bluffs on the west side of "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
Mass of limestone which crept down slopes over whole thickness of shales and fallen over cliff of Galena to end up 60 feet below the top of the Galena above the Little Maquoketa River, Iowa, late 1890s or early 1900s
Vermilya's Bluff above the Shell Rock River, Cedar Valley, Iowa, late 1890s or early 1900s
Oneota River and bluff of Devonian dolomite, above bridge at Forreston, Iowa, late 1890s or early 1900s
Yellow River and bluff below Buckland, Iowa, late 1890s or early 1900s
Located N.E.S.E. 16, Twp. 96, 4.
Effects of weathering on a bluff of limestone illustrating thin bedding, etc., Iowa, late 1890s or early 1900s
Located in Twp. 96, R. VI, Section 17, S.E. gr., S.E. 1/4.
Salient ridge and cliff of Galena Limestone, Iowa, late 1890s or early 1900s
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