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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/1501965 Title: Pyritic cone-in-cone concretions Author: Bertram G Woodland Publisher: [Chicago] : Field Museum of Natural History, 1975. OCLC:1501965
  

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Subjects

• Concretions -- Middle West.
• Pyrites -- Middle West.
• Geology, Stratigraphic -- Pennsylvanian.

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Pyritic cone-in-cone concretions

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