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  1. By: Mathews, F. Schuyler (Ferdinand Schuyler), - Ussher, R. D.
    Edition: Rev. and enl. ed.
    Publication info: New York, G.P. Putnam's Sons, c1921
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  1. By: Ussher, R. D.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 53
    Issue: 7
    Date: 1939-10
    Page Range: 101--110
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  2. By: Ussher, R. D.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 54
    Issue: 5
    Date: 1940-05
    Page Range: 75--75
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  3. By: Ussher, R. D.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 54
    Issue: 5
    Date: 1940-05
    Page Range: 74--75
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  4. By: Ussher, R. D. - Cook, Francis R.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 93
    Issue: 3
    Date: 1979
    Page Range: 321--323
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  5. By: Ussher, R. D.
    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: Ussher, R. D.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 51
    Issue: 2
    Date: 1937-02
    Page Range: 30--30
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  7. By: Ussher, R. D.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 50
    Issue: 1
    Date: 1936-01
    Page Range: 14--14
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  8. By: Ussher, R. D.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 45
    Issue: 3
    Date: 1931-03
    Page Range: 71--71
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,