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Collection: Calvin Geological Photographs
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Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s
Stratified clays in clay pit of Mason City Brick and Tile Works, Mason City, Iowa, late 1890s or early 1900s
Works of the Mason City Brick and Tile Company, from the southeast, Mason City, Iowa, late 1890s or early 1900s
Mouth of cave at Devil's Den, Iowa, late 1890s or early 1900s
Located in Twp. 99 R. 5 Section 19 N. W. gr., N. E, 1/4, N. E. corner.
Mount Hope, Union City Township, Iowa, late 1890s or early 1900s
Located north east 34, 100, 5.
Galena Limestone on the Oneota River, above Bluffton, Iowa, late 1890s or early 1900s
Waukon Sphinx left by unequal weathering, Waukon, Iowa, late 1890s or early 1900s
Iron mine, Waukon, Iowa, late 1890s or early 1900s
Located at Waukon, Northeast of, Twp. 99, R. VI, Section 36, N. W. gr., S. E. 1/4
Summit of Table Mound in driftless area, Dubuque, Iowa, late 1890s or early 1900s
Hill above New Albin, Minn., late 1890s or early 1900s
Picture taken from Iron Monument marking boundary between Iowa and Minnesota.
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