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  1. By: Wren, R. C. (Richard Cranfield), - Holmes, Edward Morell,
    Edition: 2nd ed. / with additions by E. M. Holmes.
    Publication info: London :Potter & Clarke,[1915]
    Holding Institution: University of California Libraries (archive.org)
  2. By: Wren, R. C. (Richard Cranfield),
    Publication info: London :Potter & Clarke,[1900-1950?].
    Holding Institution: University of Toronto - Gerstein Science Information Centre