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MLA

H. L. Blaisdell, United States, and Bureau of Entomology and Plant Quarantine. "Gypsy Moth Work Fiscal Year 1939." , online. Print

APA

H. L. Blaisdell, H. L. Blaisdell, United States, U. States, & Bureau of Entomology and Plant Quarantine, B. of Entomology and Plant Quarantine. (0000). Gypsy moth work fiscal year 1939.

Chicago

H. L. Blaisdell, United States, and Bureau of Entomology and Plant Quarantine. "Gypsy moth work fiscal year 1939" (1939): online.