London, Macmillan & Co., 1918.

Washington,Govt. print. off.,1912. | Library of Congress

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Washington, Govt. print. off., 1911

Medina, Ohio: A. I. Root, 1917.

[Philadelphia]Academy of Natural Sciences of Philadelphia, 1905.

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

Washington, D.C. :U.S. Dept. of Agriculture, Bureau of Entomology,1906. | U.S. Department of Agriculture, National Agricultural Librar

Medina, Ohio: A.I. Root, 1914.

Washington, D.C. :U.S. Dept. of Agriculture, Bureau of Entomology,1911. | U.S. Department of Agriculture, National Agricultural Librar

Washington, D.C.: U.S. Dept. of Agriculture, 1922.

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

publication, Farmers' Bulletin no. 1012 (first edition issued September 1918, reprint 1922)

Washington, D.C.: U.S. Dept. of Agriculture, Bureau of Entomology, 1905.