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Kames, Thornton, Iowa, late 1890s or early 1900s

Kames, Thornton, Iowa, late 1890s or early 1900s

Located northwest of Thornton.

Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s

Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s

Located in section 20 of Graham Township.

Men and boys surrounding “Jumbo” artesian well, Belle Plaine, Iowa, late 1890s or early 1900s

Men and boys surrounding “Jumbo” artesian well, Belle Plaine, Iowa, late 1890s or early 1900s

Artesian well/Jumbo well, 3 ft in diameter at surface, 195 deep through fine sand and blue clay. Bored with 2 inch drill. Water broke out. pressure 35 lbs to sq in.

Boulder of Iowan age, near the southeast corner of the park, Nora Springs, Iowa, late 1890s or early 1900s

Boulder of Iowan age, near the southeast corner of the park, Nora Springs, Iowa, late 1890s or early 1900s

Valley of Little Sioux River north of Fox Creek, Iowa, late 1890s or early 1900s

Valley of Little Sioux River north of Fox Creek, Iowa, late 1890s or early 1900s

Geology Laboratory, north room, Old Science Hall, The University of Iowa, late 1890s or early 1900s

Geology Laboratory, north room, Old Science Hall, The University of Iowa, late 1890s or early 1900s

Top works of Platt Mine, Iowa, late 1890s or early 1900s

Top works of Platt Mine, Iowa, late 1890s or early 1900s

Walter's smelter, Dubuque, Iowa, late 1890s or early 1900s

Walter's smelter, Dubuque, Iowa, late 1890s or early 1900s

Weathered face of Galena Limestone near Walter's Furnace, Dubuque, Iowa, late 1890s or early 1900s

Weathered face of Galena Limestone near Walter's Furnace, Dubuque, Iowa, late 1890s or early 1900s

Atwood Quarry, Iowa, late 1890s or early 1900s

Atwood Quarry, Iowa, late 1890s or early 1900s