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  1. By: British Museum (Natural History). Department of Geology. - Pilgrim, Guy Ellcock, - Hopwood, Arthur Tindell,
    Publication info: London, BM(NH), 1928
    Holding Institution: Natural History Museum Library, London
    BHL Collections: Natural History Museum (London) Publications
  2. By: Hopwood, Arthur Tindell, - Lang, Herbert,
    Publication info: 1929
    Holding Institution: American Museum of Natural History Library