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  1. By: Harwood, W. S. (William Sumner),
    Publication info: New York, Macmillan, 1905
    Holding Institution: Cornell University Library
  2. By: Harwood, W. S. (William Sumner),
    Edition: 2nd ed., rev. and enl.
    Publication info: New York, Macmillan, 1907
    Holding Institution: Wellcome Library
  3. By: Harwood, W. S. (William Sumner),
    Publication info: New York, The Macmillan Company, 1905
    Holding Institution: Library of Congress
  4. By: Harwood, W. S. (William Sumner),
    Edition: 2d ed., rev. and enl.
    Publication info: New York, The Macmillan Company, 1907
    Holding Institution: Cornell University Library
  5. By: Harwood, W. S. (William Sumner),
    Publication info: New York, The Macmillan Company, 1905
    Holding Institution: University of California Libraries
  6. By: Harwood, W. S. (William Sumner),
    Publication info: New York, The Macmillan company, 1905
    Holding Institution: University of Toronto - Robarts Library
  7. By: Harwood, W. S. (William Sumner),
    Edition: 2d ed., rev. and enl.
    Publication info: New York, The Macmillan company, 1907
    Holding Institution: Library of Congress
  8. By: Harwood, W. S. (William Sumner),
    Publication info: New York, Macmillan, 1906
    Holding Institution: University of California Libraries
  9. By: Harwood, W. S. (William Sumner),
    Publication info: New York, Macmillan, 1907, c1906
    Holding Institution: University of Toronto - Gerstein Science Information Centre