Search results for: Torgersen, Torolf R.

Showing 1 - 11 results of 11 Refine Results
  1. 1

    Douglas-fir tussock moth handbook : predation and parasitization of Douglas-fir tussock moth egg masses

    Authors: Torgersen, Torolf R.
    Published: Department of Agriculture : for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1979
    Physical Description: 11 pages : illustrations ; 24 cm.
    Government Document Book
  2. 2

    Identification of parasites of the Douglas-fir tussock moth, based on adults, cocoons, and puparia

    Authors: Torgersen, Torolf R.
    Published: Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1977
    Physical Description: 28 pages : illustrations ; 27 cm.
    Government Document Book
  3. 3

    Save our birds, save our forests

    Authors: Torgersen, Torolf R.
    Published: U.S. Department of Agriculture, Forest Serivce, Pacific Northwest Region, 1995
    Physical Description: 1 folded sheet (8 pages) : color illustrations ; 23 x 11 cm
    Government Document Book
  4. 4

    Parasite records for the Douglas-fir tussock moth

    Authors: Torgersen, Torolf R.
    Published: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1981
    Physical Description: 38 pages ; 28 cm.
    Government Document Book
  5. 5

    How to predict population trends

    Authors: Mason, Richard R.
    Published: U.S. Department of Agriculture, Combined Forest Pest Research and Development Program, 1983
    Other Authors: “…Torgersen, Torolf R.…”
    Physical Description: 7 pages : illustrations ; 24 cm.
    Government Document Book
  6. 6

    Field and laboratory techniques for evaluating hemlock sawfly infestations

    Authors: Hard, John S.
    Published: U.S. Forest Service, 1975
    Other Authors: “…Torgersen, Torolf R.…”
    Physical Description: 23 pages : illustrations ; 27 cm.
    Government Document Book
  7. 7

    Hemlock sawfly

    Authors: Hard, John S.
    Published: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1976
    Other Authors: “…Torgersen, Torolf R.…”
    Physical Description: 7 pages : illustrations, map ; 23 cm.
    Government Document Book
  8. 8

    Field guide for the identification of snags and logs in the interior Columbia river basin

    Authors: Parks, Catherine G.
    Published: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1997
    Other Authors:
    Physical Description: 1 online resource (40 pages) : illustrations (some color), map.
    Connect to online resource - All users (Federal Depository Library Program Persistant URL)
    Government Document Electronic eBook
  9. 9

    Trees and logs important to wildlife in the interior Columbia River basin

    Authors: Bull, Evelyn L.
    Published: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1997
    Other Authors:
    Physical Description: 1 online resource (55 pages) : illustrations (some color), maps.
    Connect to online resource - All users (Federal Depository Library Program Persistant URL)
    Government Document Electronic eBook
  10. 10

    Field guide for the identification of snags and logs in the interior Columbia river basin

    Authors: Parks, Catherine G.
    Published: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1997
    Other Authors:
    Physical Description: 40 pages : illustrations (some color), map ; 22 cm.
    Government Document Microfilm Book
  11. 11

    Trees and logs important to wildlife in the interior Columbia River Basin

    Authors: Bull, Evelyn L.
    Published: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1997
    Other Authors:
    Physical Description: 55 pages : illustrations (some color), maps ; 28 cm.
    Government Document Microfilm Book