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People on stairway at""Devil's Backbone", Backbone State Park, Dundee, Iowa, late 1890s or early 1900s
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.
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
Lencite porphyry found in Margaret Cave, Ark., late 1890s or early 1900s
Petrology
"Petrified Bridge" south of Adamano, Ariz., late 1890s or early 1900s
Group in petrified forest, Ariz., late 1890s or early 1900s
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