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Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Petrified forest south of Adamana, Ariz., late 1890s or early 1900s

Petrified forest south of Adamana, Ariz., late 1890s or early 1900s

Professor Samuel Calvin and class at the state quarry, North Liberty, Iowa, April 22, 1899

Professor Samuel Calvin and class at the state quarry, North Liberty, Iowa, April 22, 1899

Professor Samuel Calvin and class, Solon, Iowa, 1900

Professor Samuel Calvin and class, Solon, Iowa, 1900

Julien Dubuque Monument made of Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s

Julien Dubuque Monument made of Galena Limestone, Dubuque, Iowa, 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

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

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

Sea caves and wave erosion, LaJolla, Calif., 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

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

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