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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

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

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

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

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

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, 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, mastodon tusk, Marble Rock, Iowa, late 1890s or early 1900s

Pleistocene Fauna, mastodon tusk, Marble Rock, Iowa, late 1890s or early 1900s

Pleistocene Fauna, loess fossils, Iowa, late 1890s or early 1900s

Pleistocene Fauna, loess fossils, Iowa, late 1890s or early 1900s

Pleistocene Fauna, part of fossil tusk from gravel pit near Marble Rock, Iowa, late 1890s or early 1900s

Pleistocene Fauna, part of fossil tusk from gravel pit near Marble Rock, Iowa, late 1890s or early 1900s

Pleistocene Fauna, Ursus americana, late 1890s or early 1900s

Pleistocene Fauna, Ursus americana, late 1890s or early 1900s

Pleistocene Fauna, mandible of Mastodon americanus, viewed from above, worn 6th molars in place. (Note narrow spout and sockets for the tusks.), Cox Pit, Missouri Valley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, mandible of Mastodon americanus, viewed from above, worn 6th molars in place. (Note narrow spout and sockets for the tusks.), Cox Pit, Missouri Valley, Iowa, late 1890s or early 1900s