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  1. By: Hendricks, P. - Johnson, Robert F. - Montana Natural Heritage Program. - Montana Natural Resource Information System. - Montana State Library. - U.S. Fish and Wildlife Service
    Publication info: Helena, MT, Montana Natural Heritage Program, c2002
    Holding Institution: Montana State Library
  1. By: Johnson, Robert F. - Sloan, Norman F
    Type: Article
    In: The Wilson bulletin
    Volume: 90
    Issue: 3
    Date: 1978
    Page Range: 346--352
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-