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Farming conditions on drift plain, Stockton, Ill., late 1890s or early 1900s

Farming conditions on drift plain, Stockton, Ill., late 1890s or early 1900s

A.C. Trowbridge, Professor of Geology, The University of Iowa, late 1890s or early 1900s

A.C. Trowbridge, Professor of Geology, The University of Iowa, late 1890s or early 1900s

Iowan geologist J.T. Lonsdale, Iowa, late 1890s or early 1900s

Iowan geologist J.T. Lonsdale, Iowa, late 1890s or early 1900s

Geology professors and assistants in front of Old Science Hall, The University of Iowa, late 1890s or early 1900s

Geology professors and assistants in front of Old Science Hall, The University of Iowa, late 1890s or early 1900s

Palisades on the Cedar River in winter, Mount Vernon, Iowa, late 1890s or early 1900s

Palisades on the Cedar River in winter, Mount Vernon, Iowa, late 1890s or early 1900s

Palisades, Silurian stratigraphy and the Cedar River from the cave, Mount Vernon, Iowa, late 1890s or early 1900s

Palisades, Silurian stratigraphy and the Cedar River from the cave, Mount Vernon, Iowa, late 1890s or early 1900s

Falling blocks in Spring Hollow in the Palisades, Mount Vernon, Iowa, late 1890s or early 1900s

Falling blocks in Spring Hollow in the Palisades, Mount Vernon, Iowa, late 1890s or early 1900s

Cold Hollow and Palisades at the entrance on the Cedar River, Mount Vernon, Iowa, late 1890s or early 1900s

Cold Hollow and Palisades at the entrance on the Cedar River, Mount Vernon, Iowa, late 1890s or early 1900s

High cliff in the Upper Palisades, Cedar River, Mount Vernon, Iowa, late 1890s or early 1900s

High cliff in the Upper Palisades, Cedar River, Mount Vernon, Iowa, late 1890s or early 1900s

Palisades on the right bank of the Cedar River above Mud Hollow, Mount Vernon, Iowa, late 1890s or early 1900s

Palisades on the right bank of the Cedar River above Mud Hollow, Mount Vernon, Iowa, late 1890s or early 1900s