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  1. By: Capen, David E. (David Edward), - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.) - U.S. Fish and Wildlife Service. - United States. Forest Service. - University of Vermont. School of Natural Resources.
    Publication info: [Fort Collins, Colo.] :Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture,1981.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library