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  1. By: MacBride, E. W. (Ernest William), - British Antarctic ("Terra Nova") Expedition
    Publication info: [S.l, s.n.], 1920
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Echinodermata  Enteropneusta  
  2. By: Willey, Arthur,
    Publication info: Cambridge, Eng, University Press, 1900?
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Enteropneusta  Hemichordata  
  3. By: Spengel, Johann Wilhelm,
    Publication info: Berlin, Verlag von R. Friedländer & Sohn, 1893
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Enteropneusta  Hemichordata  Naples, Bay of (Italy)  Protochordates