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  1. By: Tucson Audubon Society, - United States. Forest Service. Southwestern Region,
    Edition: Slightly revised May 2015.
    Publication info: [Tucson, AZ] :U.S. Department of Agriculture, Forest Service, Southwestern Region,May 2015.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: United States. Forest Service. Southwestern Region,
    Edition: Revised January 2017.
    Publication info: [Albuquerque, N.M.] :United States Department of Agriculture, Forest Service, Southwest Region,January 2017.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library