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By: Douglass, J. R. (James Robert) - Gibson, Kenneth E. (Kenneth Edward), - United States. Entomology Research Branch.Edition:Publication info: [Beltsville, Md.?], U.S. Dept. of Agriculture, Agricultural Research Service, 1956Volume: no.33-35Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects:BHL Collections: