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By: Newcomer, E. J. (Erval Jackson), - Yothers, M. A.Edition:Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1931Volume: no.175Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects: Control Diseases and pests Fruit Oregon San Jos⥠scale Washington (State)BHL Collections: