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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Beddard, A. P. (Arthur Philip), - Flack, Martin.
    Edition: 3d ed.
    Publication info: London, E. Arnold, 1910
    Holding Institution: University of California Libraries
  2. By: Flack, Martin. - Hill, Leonard Erskine,
    Publication info: London, Arnold, 1919
    Holding Institution: University of Toronto - Gerstein Science Information Centre