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Barkbeetle enemies of California forests.
Prepared by Bureau of entomology and plant quarantine, U.S. Department of agriculture, in cooperation with State emergency relief administration--Project 3F-2-302, and Emergency educational program.

APA Citation

United States. Bureau of Entomology and Plant Quarantine. (1935). Barkbeetle enemies of California forests. Berkeley, Cal..

United States. Bureau of Entomology and Plant Quarantine. Barkbeetle Enemies of California Forests. Berkeley, Cal., 1935.

Warning: These citations may not always be complete (especially for serials).