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Phsiographic regions / John W. Powell, 1895 -- Physiographic provinces / Armin K. Lobeck, 1932, rev. -- Physical divisions / Nevin M. Fenneman, 1928 -- Physical subdivisions / Edwi...

by Geological Survey (U.S.), Powell, John Wesley, 1834-1902, Lobeck, A. K. (Armin Kohl), 1886-1958, Fenneman, Nevin Melancthon, 1865-1945, Hammond, Edwin H., Pecora, William T., Gerlach, Arch C., Overstreet, William B.
Published 1965