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

publication, Farmers' Bulletin no. 765 (first edition issued March 1917, and later editions)

publication, Farmers' Bulletin no. 780 (first edition issued November 1916, and later editions)

Washington, D.C.: U.S. Dept. of Agriculture, 1917.

Washington, D.C.: U.S. Dept. of Agriculture, 1917.

Washington, D.C. :U.S. Dept. of the Interior, Fish and Wildlife Service,1935. | U.S. Department of Agriculture, National Agricultu

Washington, 1927.

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

Wash., Govt. print. off., 1937.