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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/451821 Title: Annotated bibliography of Lower Paleozoic sponges of North America Author: J Keith Rigby; Matthew H Nitecki Publisher: [Chicago] Field Museum of Natural History, 1968. OCLC:451821

  
  

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Subjects

• Sponges, Fossil -- North America -- Bibliography.
• Paleontology -- Paleozoic -- Bibliography.
• Paleontology -- North America -- Bibliography.

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Annotated bibliography of Lower Paleozoic sponges of North America