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  1. By: Witmer, Gary William. - Pitt, William C. - Fagerstone, Kathleen A., - United States. Animal and Plant Health Inspection Service. - Wildlife Services (U.S.) - National Wildlife Research Center (U.S.)
    Publication info: Fort Collins, CO, USDA APHIS Wildlife Services, National Wildlife Research Center, 2007
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Pitt, William C. - Jordan, Peter A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 108
    Issue: 3
    Date: 1994
    Page Range: 341--346
    Publication Info: Ottawa Ottawa Field-Naturalists' Club