Some fern-like fructifications and their spores from the Mazon Creek compression flora of Illinois (Pennsylvanian) Pfefferkorn, Hermann W. creator Peppers, Russel A. (Russel Allen), 1932- joint author. contributor Phillips, Tom Lee, 1931- joint author. contributor text book Urbana Illinois State Geological Survey 1971 1971
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ENG Cover title. Bevruchting Ferns, Fossil Flora (biologie) Grundy County Illinois Paleobotany Pennsylvanian Plants, Fossil Varens Will County QE105 .A45 no. 463 561/.73 Circular (Illinois State Geological Survey), 463 https://www.biodiversitylibrary.org/bibliography/61524 334338 75637404 10.5962/bhl.title.61524 DLC