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  1. By: Ritter, William Emerson, - Bailey, Edna Watson,
    Publication info: London, G. Allen & Unwin, ltd, [1928]
    Holding Institution: University of British Columbia Library (archive.org)
  2. By: Ritter, William Emerson,
    Publication info: Berkeley, The University press, 1907
    Holding Institution: MBLWHOI Library
  3. By: Ritter, William Emerson,
    Publication info: Boston, R. G. Badger, [c1918]
    Holding Institution: University of California Libraries (archive.org)
  4. By: Ritter, William Emerson, - University College, London. Library Services.
    Publication info: Cambridge, U.S.A printed for the Museum 1893
    Holding Institution: UCL Library Services, University College London (UCL) (archive.org)
  5. By: Ritter, William Emerson, - Byxbee, Edith Sumner,
    Publication info: Cambridge, Printed for the Museum, 1905
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  6. By: Ritter, William Emerson,
    Publication info: Boston, R.G. Badger, [c1919]
    Holding Institution: MBLWHOI Library
  7. By: Ritter, William Emerson,
    Publication info: Boston, R.G. Badger, [c1919]
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  8. By: Ritter, William Emerson,
    Publication info: Boston, R. G. Badger, [c1919]
    Holding Institution: NCSU Libraries (archive.org)