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  1. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila, Bureau of Public Printing, 1905
    Holding Institution: Smithsonian Libraries and Archives
  2. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila, 1915
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  3. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila, 1904
    Holding Institution: Smithsonian Libraries and Archives
  4. By: McGregor, Richard C. (Richard Crittenden), - Worcester, Dean C. (Dean Conant),
    Publication info: Manila, Bureau of printing, 1906
    Holding Institution: University of California Libraries
  5. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila, Bureau of Public Printing, 1905
    Holding Institution: University of California Libraries
  6. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila, Bureau of Printing, 1920
    Holding Institution: Cornell University Library
  7. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila, Bureau of Printing, 1909
    Holding Institution: Multiple institutions
  8. By: Brewster, William, - Mcgirr, Newman F., - McGregor, Richard C. (Richard Crittenden), - Mcilvain, J. H. - Mcilwraith, Kennedy. - McIlwraith, Thomas, - Mckechnie, Frederick Bridgman. - Mckown, C. K. - Mclain, Walter E. - Mclaughlin, R. B.
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    BHL Collections: William Brewster Papers
  1. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 15
    Date: 1898
    Page Range: 265--267
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  2. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Philippine journal of science
    Volume: 9
    Date: 1915
    Page Range: 531--533
    Publication Info: Manila, Bureau of Science,
  3. By: Jordan, David Starr, - McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 30
    Issue: 1470
    Date: 1906-06-04
    Page Range: 813--815
    Publication Info: Washington Smithsonian Institution Press, [etc.]
  4. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 10
    Date: 1893
    Page Range: 205--206
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  5. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 20
    Date: 1903
    Page Range: 319--319
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  6. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 35
    Date: 1918
    Page Range: 370--370
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  7. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 27
    Date: 1910
    Page Range: 237--238
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  8. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 37
    Date: 1920
    Page Range: 471--472
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  9. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 18
    Date: 1901
    Page Range: 279--279
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  10. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 15
    Date: 1898
    Page Range: 187--187
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  11. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 28
    Issue: 1383
    Date: 1904
    Page Range: 115--118
    Publication Info: Washington Smithsonian Institution Press, [etc.]
  12. By: Worcester, Dean C. (Dean Conant), - McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 29
    Date: 1912
    Page Range: 267--267
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  13. By: McGregor, Richard C. (Richard Crittenden),
    Type: Article
    In: The Auk
    Volume: 15
    Date: 1898
    Page Range: 264--265
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-