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  1. By: Patton, David R. - Scott, Virgil E. - Boeker, Erwin L. - 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, 1972
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Hodges, J. J. - Boeker, Erwin L. - Hansen, A. J.,
    Type: Article
    In: The Canadian field-naturalist
    Volume: 101
    Issue: 2
    Date: 1997
    Page Range: 136--140
    Publication Info: Ottawa Ottawa Field-Naturalists' Club