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  1. By: Milne-Edwards, Alphonse,
    Publication info: Paris :Imprimerie Nationale,1873-1880.
    Holding Institution: Naturalis Biodiversity Center
    Subjects: Crustacea  Mexico  Xiphosura
  2. By: Packard, A. S. (Alpheus Spring), - National Academy of Sciences (U.S.)
    Publication info: Washington :G.P.O.,1886
    Holding Institution: Smithsonian Libraries
    Subjects: Carboniferous  Paleontology  Xiphosura