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  1. By: Worley, D. P. (David Perry),
    Publication info: Columbus, Ohio, Dept. of Agriculture, Central States Forest Experiment Station, 1963
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Ffolliott, Peter F. - Worley, D. P. (David Perry), - 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, 1973
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Ffolliott, Peter F. - Worley, D. P. (David Perry), - 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, 1965
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library