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  1. By: Thill, Ronald E. - Ffolliott, Peter F. - Patton, David R. - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
    Publication info: Fort Collins, Colo, U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, [1983]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Alterman, Lynn E - Bednarz, James C - Thill, Ronald E.
    Type: Article
    In: The Wilson bulletin
    Volume: 117
    Issue: 4
    Date: 2005
    Page Range: 353--363
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-