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Overlying Saint Croix sandstone, fold and dip shows beyond Bridge, dark line above railway marking the base of the Oneota, Quandahl, Iowa, late 1890s or early 1900s
Shearing, Specht's Ferry, Iowa, late 1890s or early 1900s
Man in front of section of Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Located west of Graf.
Bluff, Iowa, late 1890s or early 1900s
Located in Twp., 100, R.W. Section 14, N.W. gr., S. 1/2.
Gorge at Pinney's Spring, Iowa, late 1890s or early 1900s
Galena Limestone at level of "Cap Rock", Dubuque, Iowa, late 1890s or early 1900s
Effect of geological structure on topography, Graf, Iowa, late 1890s or early 1900s
Castles of limestone in driftless area near line of Illinois Central Railroad, Dubuque, Iowa, late 1890s or early 1900s
Cliff of Galena Limestone with lime works at the base, Eagle Point, Iowa, late 1890s or early 1900s
Lower bluff beds, Specht's Ferry, Iowa, late 1890s or early 1900s
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