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  1. By: Warren, P. S.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 47
    Issue: 8
    Date: 1933-11
    Page Range: 148--149
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Cameron, Alan E. - Warren, P. S.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 52
    Issue: 2
    Date: 1938-02
    Page Range: 15--21
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Warren, P. S.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 46
    Issue: 8
    Date: 1932-11
    Page Range: 184--185
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Warren, P. S.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 44
    Issue: 2
    Date: 1930-02
    Page Range: 51--51
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Warren, P. S.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 58
    Issue: 1
    Date: 1944
    Page Range: 28--29
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  6. By: Warren, P. S.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 43
    Issue: 2
    Date: 1929-02
    Page Range: 23--27
    Publication Info: Ottawa Ottawa Field-Naturalists' Club