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  1. By: Rich, Walter Herbert,
    Publication info: London, G. Harrap, 1908
    Holding Institution: University of California Libraries (archive.org)
  2. By: Rich, Walter Herbert,
    Publication info: New York, T. Y. Crowell & Co, [c1907]
    Holding Institution: Cornell University Library
  3. By: Rich, Walter Herbert,
    Publication info: New York, T.Y. Crowell, 1907
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  4. By: Rich, Walter Herbert,
    Publication info: New York, T.Y. Crowell & Co, [1907]
    Holding Institution: Smithsonian Libraries
    BHL Collections: Once There Were Billions
  5. By: Rich, Walter Herbert,
    Publication info: New York, T. Y. Crowell, [1907]
    Holding Institution: University of California Libraries (archive.org)