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  1. Pseudo-organic structures from the Precambrian Bass limestone in Arizona / [by] Matthew H. Nitecki --
    By: Nitecki, Matthew H.
    Publication info: Chicago :Field Museum of Natural History,1971.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Arizona  Geology, Stratigraphic  Grand Canyon National Park  Petrology  Precambrian  Sedimentary structures  
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