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Collection: Calvin Geological Photographs
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Map of Iowa with triangles marking the localtions of Nebraskan gumbotil and crosses marking Kansan gumbotil locations, Iowa, late 1890s or early 1900s
Pleistocene Fauna, Castoroides ohioensis, Earlham, Iowa, late 1890s or early 1900s
Pleistocene Fauna, Castoroides lower incisor, Nishnabotna Valley, Southwestern Iowa, late 1890s or early 1900s
Pleistocene Fauna, Castoroides ohioensis incisor, Nishnabotna Valley, Southwestern Iowa, late 1890s or early 1900s
Pleistocene Fauna, elephant tusks, Denison, Iowa, late 1890s or early 1900s
Pleistocene Fauna, Castoroides ohioensis, late 1890s or early 1900s
Pleistocene Fauna, 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, 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, grinding surface of 6th upper molar of Mastodon americanus Kerr from a well, Mapleton, Iowa, late 1890s or early 1900s
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