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  1. By: Simpson, Alexander Nicol.
    Publication info: London, A. and C. Black, 1911
    Holding Institution: American Museum of Natural History Library
  2. By: Simpson, Alexander Nicol.
    Publication info: London, A. and C. Black, 1913
    Holding Institution: American Museum of Natural History Library
  3. By: Simpson, Alexander Nicol.
    Publication info: London, A. and C. Black, 1913
    Holding Institution: University of California Libraries