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