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  1. By: Rich, Walter Herbert,
    Publication info: London, G. Harrap, 1908
    Holding Institution: University of California Libraries
  2. By: Rich, Walter Herbert,
    Publication info: New York, T.Y. Crowell, 1907
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  3. By: Rich, Walter Herbert,
    Publication info: New York, T.Y. Crowell & Co, [1907]
    Holding Institution: Multiple institutions
    BHL Collections: Once There Were Billions