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  1. By: Hendricks, P. - Feigley, Pete. - Montana Natural Heritage Program. - United States. Forest Service.
    Publication info: Helena, Mont. :Montana Natural Heritage Program,1997.
    Holding Institution: Montana State Library (archive.org)
    Subjects: Birds of prey  Custer National Forest (Mont. and S.D.)  Golden eagle  Great horned owl  Harding County  Harding County (S.D.)  Merlin (Bird)  Nests  North Cave Hills (S.D.)  Prairie falcon  Red-tailed hawk  South Cave Hills (S.D.)  South Dakota  Surveys  
  2. By: Schowalter, D. T. - Alberta. Fish and Wildlife Division. - Alberta. Alberta Sustainable Resource Development.
    Publication info: Edmonton :Alberta Sustainable Resource Development, Fisheries & Wildlife Management Division, Resource Status and Assessment Branch,2001.
    Holding Institution: University of Alberta Libraries (archive.org)
    Subjects: Alberta  Food  Geographical distribution  Great horned owl  Mammals  Wildlife management  
  3. By: Hannon, Susan Jean, - Alberta. Alberta Environmental Protection. - Manning Diversified Forest Products Research Trust Fund.
    Publication info: [Manning, Alta.] :Alberta Environmental Protection,1998.
    Holding Institution: University of Alberta Libraries (archive.org)
    Subjects: Alberta  Barred owl  Birds  Effect of logging on  Great horned owl  Owls  Taiga ecology  
  4. By: Hannon, Susan Jean, - Alberta. Alberta Environmental Protection. - Manning Diversified Forest Products Research Trust Fund.
    Publication info: [Manning, Alta.] :Alberta Environmental Protection,1997.
    Holding Institution: University of Alberta Libraries (archive.org)
    Subjects: Alberta  Barred owl  Birds  Effect of logging on  Great horned owl  Owls  Taiga ecology  
  5. By: Snyder, L. L. (Lester Lynne), - Royal Ontario Museum.
    Publication info: [Toronto] :Royal Ontario Museum,1961.
    Holding Institution: University of Toronto - Royal Ontario Museum Library & Archives
    Subjects: Great horned owl  
  6. By: Marshall, Margaret E.
    Publication info: 1906.
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    Subjects: Aeronautes  Anatomy  Birds  Great horned owl  Roadrunner