dcsimg
Please read BHL's Acknowledgment of Harmful Content
Sort By:
  1. By: Sheppard, David H - Klopfer, Peter H - Oelke, Hans
    Type: Article
    In: The Wilson bulletin
    Volume: 80
    Issue: 4
    Date: 1968
    Page Range: 452--457
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Sheppard, David H - Swanson, Stella M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 90
    Issue: 2
    Date: 1976
    Page Range: 170--172
    Publication Info: Ottawa Ottawa Field-Naturalists' Club