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Igneous rock classification, late 1890s or early 1900s

Igneous rock classification, late 1890s or early 1900s

Chart of general table of geologic divisions

Chart of general table of geologic divisions

Iowa Geological Section chart, late 1890s or early 1900s

Iowa Geological Section chart, late 1890s or early 1900s

The winding way, Iowa City, Iowa, late 1890s or early 1900s

The winding way, Iowa City, Iowa, late 1890s or early 1900s

House, Iowa, late 1890s or early 1900s

House, Iowa, late 1890s or early 1900s

Grindewald Glacier, Alps, late 1890s or early 1900s

Grindewald Glacier, Alps, late 1890s or early 1900s

Missouri River and flood plain with Missouri and South Dakota bluffs seen from the Nebraska side of the river, Yankton, S.D., late 1890s or early 1900s

Missouri River and flood plain with Missouri and South Dakota bluffs seen from the Nebraska side of the river, Yankton, S.D., late 1890s or early 1900s

Sea caves and wave erosion, LaJolla, Calif., late 1890s or early 1900s

Sea caves and wave erosion, LaJolla, Calif., late 1890s or early 1900s

Shore forms are results of wave erosion, Calif., late 1890s or early 1900s

Shore forms are results of wave erosion, Calif., late 1890s or early 1900s

Cathedral from harbor, Antwerp, Belgium, late 1890s or early 1900s

Cathedral from harbor, Antwerp, Belgium, late 1890s or early 1900s