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Pleistocene Fauna, side view of a mastodon jaw, 6th molar in place, but much worn, late 1890s or early 1900s

Pleistocene Fauna, side view of a mastodon jaw, 6th molar in place, but much worn, late 1890s or early 1900s

Pleistocene Fauna, side view of a mastodon jaw, 6th molar in place, but much worn, late 1890s or early 1900s

Pleistocene Fauna, side view of a mastodon jaw, 6th molar in place, but much worn, late 1890s or early 1900s

Pleistocene Fauna, side of molars of Equus scotti Gidley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, side of molars of Equus scotti Gidley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, side of molars of Equus scotti Gidley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, side of molars of Equus scotti Gidley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, right upper 6th molar of Mammoth mirificum Leidy, Mastodon mirificum Leidy, reached in digging well through Kansan Drift on Mr. Jensen's farm near Akron, Iowa, late 1890s or early 1900s

Pleistocene Fauna, right upper 6th molar of Mammoth mirificum Leidy, Mastodon mirificum Leidy, reached in digging well through Kansan Drift on Mr. Jensen's farm near Akron, Iowa, late 1890s or early 1900s

Pleistocene Fauna, right upper 6th molar of Mammoth mirificum Leidy, Mastodon mirificum Leidy, reached in digging well through Kansan Drift on Mr. Jensen's farm near Akron, Iowa, late 1890s or early 1900s

Pleistocene Fauna, right upper 6th molar of Mammoth mirificum Leidy, Mastodon mirificum Leidy, reached in digging well through Kansan Drift on Mr. Jensen's farm near Akron, 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, 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, part of an elephant pelvis, Oskaloosa, Iowa, late 1890s or early 1900s

Pleistocene Fauna, part of an elephant pelvis, Oskaloosa, Iowa, late 1890s or early 1900s

Pleistocene Fauna, part of an elephant pelvis, Oskaloosa, Iowa, late 1890s or early 1900s

Pleistocene Fauna, part of an elephant pelvis, Oskaloosa, Iowa, late 1890s or early 1900s