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  1. By: Vogler, Detlev. - Scharpf, Robert F., - United States. Forest Pest Management.
    Publication info: San Francisco, Calif. :USDA, Forest Service, Pacific Southwest Region, State and Private Forestry, Forest Pest Management,[1981]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Hawksworth, Frank G. (Frank Goode), - Scharpf, Robert F., - United States. Forest Service.
    Publication info: [Washington, D.C.?] :U.S. Dept. of Agriculture, Forest Service,1981.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library