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  1. Pennsylvanian conodont assemblages from La Salle County, Northern Ill. /
    By: Collinson, Charles. - Geological Society of America. Meeting DeKalb, Ill.) - Geological Society of America. North-Central Section. Meeting DeKalb, Ill.) - Pander Society.
    Publication info: Urbana :Illinois State Geological Survey,1972
    Holding Institution: University Library, University of Illinois Urbana Champaign
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