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  1. Internal structures of Cyclocrinites dactioloides : a receptaculitid alga from the Lower Silurian of Iowa / Matthew H. Nitecki -- and Markes E. Johnson --.
    By: Nitecki, Matthew H. - Johnson, Markes E. - Field Museum of Natural History.
    Publication info: Chicago :Field Museum of Natural History,1978.
    Contributed by: University of Illinois Urbana Champaign
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