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  1. By: Spencer, J. W. (Joseph William),
    Publication info: [Philadelphia :American Philosophical Society],1881.
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Hull, Edward, - Spencer, J. W. (Joseph William),
    Publication info: London,E. Stanford,1912.
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
  3. By: Spencer, J. W. (Joseph William),
    Publication info: S.l. :s.n.,1882?
    Holding Institution: Canadiana.org (archive.org)