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Projecting block of Galena Limestone, receptaculites horizon 60 feet below top of Galena located southeast of Rockville, Iowa, late 1890s or early 1900s
Mill on the Oneota River , Florenceville, Iowa, late 1890s or early 1900s
Picture taken from bridge at Florenceville.
Oneota Limestone as a building stone, Eitzen, Minn., late 1890s or early 1900s
Located near north line of Allamakee Co.
Castle of Galena limestone near Catfish Creek and Illinois Central Railroad, Dubuque, Iowa, late 1890s or early 1900s
Located west of Dubuque.
Flood waters carried boulders to where wash of hill emerges on small plain, Dorchester, Iowa, late 1890s or early 1900s
Located at Dorchester, Twp. 100, R. V. Section 13.
Lower bluff beds, Specht's Ferry, Iowa, late 1890s or early 1900s
Cliff of Galena Limestone with lime works at the base, Eagle Point, 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
Effect of geological structure on topography, Graf, Iowa, late 1890s or early 1900s
Galena Limestone at level of "Cap Rock", Dubuque, Iowa, late 1890s or early 1900s
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