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MLA

Yothers, M. A. Biology and control of tree hoppers injurious to fruit trees in the Pacific Northwest . U.S. Dept. of Agriculture, 1934.

APA

Yothers, M. A. (1934). Biology and control of tree hoppers injurious to fruit trees in the Pacific Northwest. U.S. Dept. of Agriculture.

Chicago

Yothers, M. A. Biology and control of tree hoppers injurious to fruit trees in the Pacific Northwest . U.S. Dept. of Agriculture, 1934.