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  1. By: Hopkins, Rick B. - Cassel, J. Frank, - Bjugstad, Ardell J. - 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, 1986
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Linz, George M - Vakoch, Daniel L. - Cassel, J. Frank, - Carlson, Robert Bruce
    Type: Article
    In: The Canadian field-naturalist
    Volume: 98
    Issue: 1
    Date: 1984
    Page Range: 38--44
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Snyder, Dana P. - Cassel, J. Frank,
    Type: Article
    In: The Wilson bulletin
    Volume: 63
    Issue: 3
    Date: 1951
    Page Range: 177--180
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Avery, Michael L. - Springer, Paul F - Cassel, J. Frank,
    Type: Article
    In: The Wilson bulletin
    Volume: 89
    Issue: 2
    Date: 1977
    Page Range: 291--299
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-