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  1. By: Walcott, Charles D. (Charles Doolittle),
    Publication info: Washington, Govt. print. off, 1898
    Holding Institution: MBLWHOI Library
    Subjects: Jellyfishes, Fossil
  2. By: Johnson, Ralph Gordon, - Richardson, Eugene S., (Eugene Stanley), Jr.
    Publication info: [Chicago], Field Museum Press, 1968
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Essex  Illinois  Jellyfishes, Fossil  Paleontology  Pennsylvanian