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MLA

Campbell, Robert W, United States, and Forest Service. "Gypsy Moth : Forest Influence." , p.. Print

APA

Campbell, R. W, United States, U. States, & Forest Service, F. Service. (1979). Gypsy moth : forest influence.

Chicago

Campbell, Robert W., United States, and Forest Service. "Gypsy moth : forest influence" (0000): p..