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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Frest, Terrence J. - Mikulic, Donald G. - Paul, C. R. C. (Christopher R. C.)
    Publication info: Chicago, Field Museum of Natural History, 1977
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Holocystites  Middle west  Paleontology  Silurian