1923

1922

Washington, D.C.: U.S. Dept. of Agriculture, 1916.

Washington, D.C.: U.S. Dept. of Agriculture, 1923.

Washington, D.C.: U.S. Dept. of Agriculture, 1916.

Washington, National Geographic Society, 1920.

Washington, D.C.: U.S. Dept. of Agriculture, 1924.

Washington, D.C.: U.S. Dept. of Agriculture, 1925.

Washington, D.C.: U.S. Dept. of Agriculture, 1919

Washington, D.C.: U.S. Dept. of Agriculture, 1923.

1904-1905 | Smithsonian Institution Archives

Washington, D.C.: U.S. Dept. of Agriculture, 1915

Philadelphia: Turner & Fisher, publishers, 1842.

book by Alexander Wetmore

Washington: Smithsonian Institution, 1965-

Washington, D.C.: U.S. Dept. of Agriculture, 1918.

Cambridge, Harvard University Press, 1926.

New York: Smithsonian Institution Series, inc., 1931.

Washington, D.C.: U.S. Dept. of Agriculture, 1921.