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  1. By: Nitecki, Matthew H. - Ross, Lillian A.
    Publication info: [Chicago], Chicago Natural History Museum Press, 1963
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Chicago Natural History Museum  Eurypterida  Radiolaria, Fossil  Type specimens (Natural history)  University of Chicago  Walker Museum of Paleontology
  2. By: Nigrini, Catherine. - Nitecki, Matthew H.
    Publication info: [Chicago], Field Museum of Natural History, 1968
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Arkansas  Mississippian  Paleontology  Radiolaria, Fossil
  3. By: Haeckel, Ernst,
    Publication info: Berlin, G. Reimer, 1862-1888
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    Subjects: Radiolaria  Radiolaria, Fossil  Rhizopoda