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  1. By: Cassels, Elsie
    Type: Article
    In: The Canadian field-naturalist
    Volume: 34
    Issue: 5
    Date: 1920-05
    Page Range: 99--99
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Cassels, Elsie
    Type: Article
    In: The Canadian field-naturalist
    Volume: 34
    Issue: 8
    Date: 1920-11
    Page Range: 159--159
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Cassels, Elsie
    Type: Article
    In: The Canadian field-naturalist
    Volume: 38
    Issue: 2
    Date: 1924-02
    Page Range: 34--34
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Cassels, Elsie
    Type: Article
    In: The Canadian field-naturalist
    Volume: 37
    Issue: 2
    Date: 1923-02
    Page Range: 30--30
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Cassels, Elsie
    Type: Article
    In: The Canadian field-naturalist
    Volume: 49
    Issue: 8
    Date: 1935-11
    Page Range: 140--140
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  6. By: Cassels, Elsie
    Type: Article
    In: The Canadian field-naturalist
    Volume: 42
    Issue: 6
    Date: 1928-09
    Page Range: 150--150
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  7. By: Cassels, Elsie
    Type: Article
    In: The Canadian field-naturalist
    Volume: 51
    Issue: 1
    Date: 1937-01
    Page Range: 12--12
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  8. By: Cassels, Elsie
    Type: Article
    In: The Canadian field-naturalist
    Volume: 36
    Issue: 3
    Date: 1922-03
    Page Range: 58--58
    Publication Info: Ottawa Ottawa Field-Naturalists' Club