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  1. By: Wittwer, Dustin. - Boughton, Jerry. - United States. Forest Health Protection. - Alaska. Division of Forestry.
    Publication info: Anchorage, Alaska, Forest Health Protection, State and Private Forestry, Alaska Region, USDA Forest Service, [2001]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Wittwer, Dustin. - Matthews, Kathleen. - United States. Forest Health Protection. - Alaska. Division of Forestry.
    Publication info: Anchorage, Alaska, Forest Health Protection, State and Private Forestry, Alaska Region, USDA Forest Service, [1998]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Wittwer, Dustin. - Zogas, Ken. - United States. Forest Health Protection. - Alaska. Division of Forestry.
    Publication info: Anchorage, Alaska, Forest Health Protection, State and Private Forestry, Alaska Region, USDA Forest Service, [2003]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library