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Old green shales bed of the Lower Trenton with natural size Orthis Dlamanella,subeauata, con. and Orthis Tricenaria con, Waukon, Iowa, late 1890s or early 1900s
Effects of weathering on a bluff of Trenton Limestone, Postville, Iowa, late 1890s or early 1900s
Located in Twp. 96, R. VI, Section 17, S.E. gr., S.E. 1/4 north of Postville.
Bluffs on Upper Iowa or Oneota River, Decorah, Iowa, late 1890s or early 1900s
Rocks in the valley of the Yellow River, Iowa, late 1890s or early 1900s
Located in Twp. 96, R.V., Section 14, S.W. gr., N.W. 1/4.
Julien Dubuque Monument made of Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
Weathered face of Galena Limestone near Walter's Furnace, Dubuque, Iowa, late 1890s or early 1900s
Man standing at top of waterfall in Devil's Den, Iowa, late 1890's or early 1900s
"Devil's Den" located at Twp. 99, R. V, Section 19, N.W. gr., N.E. 1/4, N.E. corner.
Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Illustration of the first lead mining in Dubuque, Iowa, 1850s
Brachiopods and Orthidae fossils
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