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Collection: Calvin Geological Photographs
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Fine quality of quarry stone with evenly bedded limestone about 40 feet above the Saint Croix, Iowa, late 1890s or early 1900s
Located in Twp. 100, R. V. Section 18, N. W. 1/4, N. E. corner.
Field class near West Hill section, Muscatine, Iowa, June 1910
Fayal Iron Mine, Minnesota, late 1890s or early 1900s
Favosites niagarensis, with stems of Amplexus associated with it, Monticello, Iowa, late 1890s or early 1900s
Located 6 miles southeast of Monticello.
Farming conditions on drift plain, Stockton, Ill., late 1890s or early 1900s
Farming conditions on drift plain, Stockton, Ill., late 1890s or early 1900s
Family party at the home of R.G. Crawford, Hopkinton, Iowa, late 1890s or early 1900s
Falls of Fall River, Dakota Sandstone and Benton shales at falls, Fall River, Hot Springs, S.D., late 1890s or early 1900s
Located 4 miles East of Hot Springs, South Dakota.
Falls in Carboniferous forms on Indian Spring, Burlington, Iowa, late 1890s or early 1900s
Falls and rapids on roaring Jim Creek, Jamestown, Colo., late 1890s or early 1900s
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