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MLA

United States, and Bureau of Entomology. "Directory of Field Activities of the Bureau of Entomology." , 56. Print

APA

United States, U. States, & Bureau of Entomology, B. of Entomology. (1930). Directory of field activities of the Bureau of Entomology.

Chicago

United States, and Bureau of Entomology. "Directory of field activities of the Bureau of Entomology" (0000): 56.