Michelson, Truman (1879–1938)

Michelson, Truman (1879–1938)

Mooney, James (1861–1921)

Kurz, Rudolf Friedrich (1818–1871)

Bushnell, David Ives (1875–1941)

Bumstead, Albert Holt (1875–1940) National Geographic Society. National Geographic Maps

Michelson, Truman (1879–1938)

Michelson, Truman (1879–1938)

Michelson, Truman (1879–1938)

Bushnell, David Ives (1875–1941)

Buchanan, L. L.

Jeançon, Jean Allard

Michelson, Truman (1879–1938)

Bushnell, David Ives (1875–1941)

Bushnell, David Ives (1875–1941)

Banta, Arthur M. (1877–1946)

Marsh, Charles Dwight (1855–1932) Clawson, Arthur Brooks (1878–1937) Marsh, Hadleigh (1888-?)

Schaus, William (1858–1942)

Ridgway, Robert (1850–1929)

Chittenden, Frank Hurlbut (1885–1929)

Juday, Chancey (1871–1944)

Forest Service and Extension Service [U.S.A.]

Marsh, Charles Dwight (1855–1932) Clawson, Arthur Brooks (1878–1937) Eggleston, Willard Webster (1863–1935)

United States Department of Agricultur.

Aldrich, John Merton (1866–1934)