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By: Pfefferkorn, Hermann W. - Peppers, Russel A. (Russel Allen), - Phillips, Tom Lee,Edition:Publication info: Urbana, Illinois State Geological Survey, 1971Volume: Circular no.463Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects:BHL Collections:
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By: Pfefferkorn, Hermann W. - Illinois. Dept. of Registration and Education. - Illinois State Geological Survey.Edition:Publication info: Urbana, Illinois State Geological Survey, 1976Volume: Circular no.492Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects:BHL Collections:
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By: Pfefferkorn, Hermann W.Edition:Publication info: Chicago, Field Museum of Natural History, 1976Volume: v.33:no.17 (1976)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects:BHL Collections:
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By: Leary, Richard L. - Pfefferkorn, Hermann W. - Illinois State Museum.Edition:Publication info: Urbana, Illinois State Geological Survey, 1977Volume: Circular no.500Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects:BHL Collections:
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By: Dimichele, William A - Gastaldo, Robert A - Pfefferkorn, Hermann W.Type: ArticleIn: Proceedings of the California Academy of Sciences, 4th seriesVolume: 56, Supplement ISeries: 4Issue: 4Date: 2005-06-03Page Range: 32--49Publication Info: San Francisco California Academy of SciencesSubjects: