dcsimg
Please read BHL's Acknowledgment of Harmful Content
Sort By:
  1. By: Ritchie, Robert J - Ambrose, Robert E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 3
    Date: 1992
    Page Range: 316--320
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Ritchie, Robert J - Ambrose, Robert E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 92
    Issue: 3
    Date: 1978
    Page Range: 293--293
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Ritchie, Robert J - Ambrose, Robert E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 101
    Issue: 1
    Date: 1997
    Page Range: 86--87
    Publication Info: Ottawa Ottawa Field-Naturalists' Club