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Cliff of Trenton Limestone, crowned with pines, Cold Water Spring Preserve, Bluffton, Iowa, late 1890s or early 1900s
Bluffton, above; top of bluff at Cold Spring
Profile of Painted Rock, Waukon Junction, Iowa, late 1890s or early 1900s
Salient ridge and cliff of Galena Limestone, Iowa, late 1890s or early 1900s
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.
Yellow River and bluff below Buckland, Iowa, late 1890s or early 1900s
Located N.E.S.E. 16, Twp. 96, 4.
Oneota River and bluff of Devonian dolomite, above bridge at Forreston, Iowa, late 1890s or early 1900s
Vermilya's Bluff above the Shell Rock River, Cedar Valley, 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
Maquoketa River and pine covered bluffs on the west side of "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
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.
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