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  1. By: McKnight, Melvin E. - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
    Publication info: Fort Collins, Colo, Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1968
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: McKnight, Melvin E. - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
    Publication info: Fort Collins, Colo, Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1971
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: McKnight, Melvin E. - Gillespie, Robert E. - Ketcham, David E. - United States. Forest Service.
    Publication info: [Washington, D.C.?], Forest Service, U.S. Dept. of Agriculture, 1977
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library