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  1. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 21
    Issue: 6
    Date: 1907-09
    Page Range: 96--97
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  2. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 22
    Issue: 12
    Date: 1909-03
    Page Range: 262--265
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  3. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Wilson bulletin
    Volume: 23
    Series: new
    Issue: 2
    Date: 1911
    Page Range: 119--125
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  4. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 24
    Issue: 9
    Date: 1910-12
    Page Range: 152--163
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  5. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 24
    Issue: 10
    Date: 1911-01
    Page Range: 176--187
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  6. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 24
    Issue: 11
    Date: 1911-02
    Page Range: 198--206
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  7. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 24
    Issue: 12
    Date: 1911-03
    Page Range: 222--228
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  8. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Auk
    Volume: 32
    Date: 1915
    Page Range: 95--96
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  9. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Auk
    Volume: 32
    Date: 1915
    Page Range: 98--100
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  10. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 21
    Issue: 10
    Date: 1908-01
    Page Range: 185--187
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  11. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 20
    Issue: 4
    Date: 1906-07
    Page Range: 79--81
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  12. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Wilson bulletin
    Volume: 45
    Issue: 2
    Date: 1933
    Page Range: 60--66
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  13. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Auk
    Volume: 37
    Date: 1920
    Page Range: 551--558
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  14. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 20
    Issue: 2
    Date: 2313
    Page Range: 33--40
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  15. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Wilson bulletin
    Volume: 34
    Issue: 2
    Date: 1922
    Page Range: 90--94
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  16. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 18
    Issue: 3
    Date: 1904-06
    Page Range: 77--80
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  17. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 19
    Issue: 4
    Date: 1905-07
    Page Range: 95--98
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  18. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 19
    Issue: 7
    Date: 1905-10
    Page Range: 143--146
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  19. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 19
    Issue: 2
    Date: 1905-05
    Page Range: 56--58
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  20. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Auk
    Volume: 36
    Date: 1919
    Page Range: 513--524
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  21. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Auk
    Volume: 32
    Date: 1915
    Page Range: 108--110
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  22. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Auk
    Volume: 23
    Date: 1906
    Page Range: 313--318
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  23. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Wilson bulletin
    Volume: 40
    Issue: 4
    Date: 1928
    Page Range: 216--218
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  24. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Auk
    Volume: 22
    Date: 1905
    Page Range: 312--313
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  25. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Auk
    Volume: 22
    Date: 1905
    Page Range: 233--241
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  26. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Wilson bulletin
    Volume: 23
    Series: new
    Issue: 1
    Date: 1911
    Page Range: 49--52
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  27. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 24
    Issue: 1
    Date: 1910-04
    Page Range: 22--22
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  28. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 23
    Issue: 6
    Date: 1909-09
    Page Range: 113--115
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  29. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 21
    Issue: 2
    Date: 1907-05
    Page Range: 35--37
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  30. By: Eifrig, Charles William Gustav - Kingston, A. G.
    Type: Article
    In: The Ottawa naturalist
    Volume: 22
    Issue: 2
    Date: 1908-05
    Page Range: 46--48
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  31. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Wilson bulletin
    Volume: 42
    Issue: 4
    Date: 1930
    Page Range: 239--240
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  32. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 21
    Issue: 5
    Date: 1907-08
    Page Range: 83--88
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  33. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 18
    Issue: 6
    Date: 1904-09
    Page Range: 118--120
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  34. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 20
    Issue: 11
    Date: 1907-02
    Page Range: 217--220
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  35. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 20
    Issue: 7
    Date: 1906-10
    Page Range: 144--149
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  36. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 24
    Issue: 1
    Date: 1910-04
    Page Range: 18--20
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  37. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Wilson bulletin
    Volume: 27
    Series: new
    Issue: 4
    Date: 1915
    Page Range: 458--460
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  38. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Wilson bulletin
    Volume: 25
    Series: new
    Issue: 3
    Date: 1913
    Page Range: 138--145
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  39. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 18
    Issue: 1
    Date: 1904-04
    Page Range: 18--23
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  40. By: Eifrig, Charles William Gustav
    Type: Article
    In: The Ottawa naturalist
    Volume: 22
    Issue: 3
    Date: 1908-06
    Page Range: 65--66
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,