Pennsylvanian tree fern compressions Caulopteris, Megaphyton, and Artisophyton gen. nov. in Illinois Pennsylvanian tree fern compressions Pfefferkorn, Hermann W. creator Illinois. Dept. of Registration and Education. contributor Illinois State Geological Survey. contributor text book Urbana Illinois State Geological Survey 1976 1976
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ENG Cover title. At head of title: State of Illinois. Department of Registration and Education. Bomen (biologie) Ferns, Fossil Illinois Paleobotany Pennsylvanian Varens QE105 .A45 no. 492 561/.73 Circular (Illinois State Geological Survey), 492 https://www.biodiversitylibrary.org/bibliography/61459 2154852 76623306 10.5962/bhl.title.61459 DLC