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