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Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s
Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s
Cliff of Galena limestone, Durango, Iowa, late 1890s or early 1900s
Cliff of Galena limestone, Durango, Iowa, late 1890s or early 1900s
Cliff of Galena Limestone with lime works at the base, Eagle Point, Iowa, late 1890s or early 1900s
Cliff of Galena Limestone with lime works at the base, Eagle Point, Iowa, late 1890s or early 1900s
Cliff above Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Cliff above Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Castles of limestone in driftless area near line of Illinois Central Railroad, Dubuque, 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
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