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U.S. Geological Survey (1945)

1905 edition, reprinted 1945.

U.S. Geoogical Survey (1945)

1942 edition, reprinted 1945.

U.S. Geological Survey (1942)

1903 edition, reprinted 1942.

U.S. Geological Survey (1942)

U.S. Geological Survey (1945)

Unknown author (Washington: War Dept., Corps. of Engineers, U.S. Army, 1942)

U.S. Geological Survey (1945)

1904 edition, reprinted 1945.

U.S. Geological Survey (1944)

1901 edition, reprinted 1944.

U.S. Geological Survey (1945)

1901 edition, reprinted 1945.

U.S. Geological Survey (1941)

1914 edition, reprinted 1941.