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  1. By: Torgersen, Torolf R. - 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, 1977
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Torgersen, Torolf R. - Torgersen, Anna S. - United States. Forest Service. Pacific Northwest Region. - Pacific Northwest Research Station (Portland, Or.)
    Publication info: Portland, OR, U.S. Dept. of Agriculture, Forest Serivce, Pacific Northwest Region, [1995]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Halaj, Juraj - Ross, D W - Mason, R R - Torgersen, Torolf R. - Moldenke, A R
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 72
    Issue: 1
    Date: 1996
    Page Range: 17--26
    Publication Info: San Francisco, Pacific Coast Entomological Society,
  2. By: Furniss, Malcolm M. - Johnson, James B. (James Blakeslee), - Westcott, Richard L. - Torgersen, Torolf R.
    Type: Article
    In: The Great Basin naturalist
    Volume: 52
    Issue: 4
    Date: 1992
    Page Range: 373--377
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,
  3. By: Torgersen, Torolf R.
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 47
    Date: 1971
    Page Range: 215--219
    Publication Info: San Francisco, Pacific Coast Entomological Society,
  4. By: Wickman, Boyd E. - Torgersen, Torolf R.
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 63
    Issue: 3
    Date: 1987
    Page Range: 218--223
    Publication Info: San Francisco, Pacific Coast Entomological Society,