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  1. By: Wickman, Boyd E. - Pacific Northwest Forest and Range Experiment Station (Portland, Or.) - United States. Forest Service.
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1978
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: California  Diseases and pests  Douglas-fir tussock moth  Tree declines  Trees  
  2. By: United States. Forest Service. Intermountain Region.
    Publication info: [Cedar City, UT], US Dept. of Agriculture, Forest Service, Intermountain Region, Dixie National Forest, [2000?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Diseases and pests  Dixie National Forest  Dixie National Forest (Utah)  Forest ecology  Forests and forestry  Spruce  Spruce bark beetles  Tree declines  Utah