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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Cowan, T. W. (Thomas William),
    Edition: 20th ed. 75th thousand.
    Publication info: London, Madgwick, Houlston, [1911]
    Holding Institution: NCSU Libraries
  2. By: Cowan, T. W. (Thomas William),
    Edition: 2nd ed.
    Publication info: London, Houlston & sons, [pref.1904]
    Holding Institution: Cornell University Library
  3. By: Cowan, T. W. (Thomas William),
    Publication info: London, Houlston, [1890]
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  4. By: Dennler, J. - Cowan, T. W. (Thomas William),
    Publication info: Kings Langley, Herts, J. Huckle, 1889
    Holding Institution: University of California Libraries