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  1. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 36
    Issue: 4
    Date: 1920-04
    Page Range: 61--66
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 47
    Issue: 2
    Date: 1933-02
    Page Range: 23--31
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Williams, M. Y.
    Type: Article
    In: The Ottawa naturalist
    Volume: 32
    Issue: 2
    Date: 1918-05
    Page Range: 37--38
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  4. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 33
    Issue: 2
    Date: 1919-05
    Page Range: 40--41
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 33
    Issue: 1
    Date: 1919-04
    Page Range: 10--11
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  6. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 56
    Issue: 4
    Date: 1942-04
    Page Range: 60--62
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  7. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 56
    Issue: 6
    Date: 1942-09
    Page Range: 92--94
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  8. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 56
    Issue: 5
    Date: 1942-05
    Page Range: 70--81
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  9. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 35
    Issue: 5
    Date: 1921-05
    Page Range: 94--98
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  10. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 34
    Issue: 7
    Date: 1920-10
    Page Range: 121--126
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  11. By: Williams, M. Y.
    Type: Article
    In: The Ottawa naturalist
    Volume: 29
    Issue: 8
    Date: 1915-11
    Page Range: 89--90
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  12. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 39
    Issue: 4
    Date: 1925-04
    Page Range: 69--72
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  13. By: Williams, M. Y.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 60
    Issue: 3
    Date: 1946
    Page Range: 47--60
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  14. By: Williams, M. Y. - Spencer, G. J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 56
    Issue: 8-9
    Date: 1942-12
    Page Range: 138--138
    Publication Info: Ottawa Ottawa Field-Naturalists' Club