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Pleistocene Fauna, left upper 6th molar of Mammut mirificum Leidy, Mastodon mirificus Leidy, dug through Kansan Drift, about 5/6 natural size, worn, Mr. Jensen's farm, Afton, Iowa, late 1890s or early 1900s

Pleistocene Fauna, left upper 6th molar of Mammut mirificum Leidy, Mastodon mirificus Leidy, dug through Kansan Drift, about 5/6 natural size, worn, Mr. Jensen's farm, Afton, Iowa, late 1890s or early 1900s

Pleistocene Fauna, Mammut americanum Kerr, Mastodon americanus of authors, 6th molar, well worn, side view, late 1890s or early 1900s

Pleistocene Fauna, Mammut americanum Kerr, Mastodon americanus of authors, 6th molar, well worn, side view, late 1890s or early 1900s

Turin
Pleistocene Fauna, large tusk with base, March 25, 1910

Pleistocene Fauna, large tusk with base, March 25, 1910

Residence of Governor Wm. Larrabee, Iowa, late 1890s or early 1900s

Residence of Governor Wm. Larrabee, Iowa, late 1890s or early 1900s

Model of anthracite coal formations and methods of mining, Pennsylvania, late 1890s or early 1900s

Model of anthracite coal formations and methods of mining, Pennsylvania, late 1890s or early 1900s

Loess sections, Natchez, Miss., late 1890s or early 1900s

Loess sections, Natchez, Miss., late 1890s or early 1900s

Iowa River seen from the bridge at Butler's Landing, Iowa City, Iowa, late 1890s or early 1900s

Iowa River seen from the bridge at Butler's Landing, Iowa City, Iowa, late 1890s or early 1900s

Looks east.
Niobrara chalk beds of the cement company's works, Yankton, S.D., late 1890s or early 1900s

Niobrara chalk beds of the cement company's works, Yankton, S.D., late 1890s or early 1900s

Niobrara chalk cliffs near Yankton, S.D., late 1890s or early 1900s

Niobrara chalk cliffs near Yankton, S.D., late 1890s or early 1900s

Bridge, Muscatine County, Iowa, late 1890s or early 1900s

Bridge, Muscatine County, Iowa, late 1890s or early 1900s