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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: Bevruchting Ferns, Fossil Flora (biologie) Grundy County Illinois Paleobotany Pennsylvanian Plants, Fossil Varens Will CountyBHL Collections: