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Collection: Calvin Geological Photographs
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Outlier of Niagaran limestone in Williams Quarry, Clermont, Iowa, late 1890s or early 1900s
Quarry with Niagaran Limestone and Le Claire limestone, Sugar Creek, Iowa, late 1890s or early 1900s
Columns of St. Croix sandstone, Iowa, late 1890s or early 1900s
Located on Lane's Farm, Twp. 100, NR. IV, Section 31, N.W. gr., N.W. 1/4.
Flat railroad cars in Champion Quarry, Stone City, Iowa, late 1890s or early 1900s
Bluffs on Upper Iowa or Oneota River, Decorah, Iowa, late 1890s or early 1900s
Building at base of cliff of purple limestone of the red beds, Chautauqua grounds, Hot Springs, S.D., late 1890s or early 1900s
Effects of weathering on a bluff of Trenton Limestone, Postville, Iowa, late 1890s or early 1900s
Located in Twp. 96, R. VI, Section 17, S.E. gr., S.E. 1/4 north of Postville.
Cliffs above the mill, Clay Mill, Iowa, late 1890s or early 1900s
Geology Club composed of faculty and graduate students at Iowa University; The University of Iowa, 1924
Geology Club, The University of Iowa, May 7, 1934
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