Distribution of boghead algae in Illinois Basin coal beds Peppers, Russel Allen, 1932- creator Harvey, Richard D. (Richard David), 1928- contributor Illinois State Geological Survey. contributor text book Champaign, Ill Dept. of Natural Resources, Illinois State Geological Survey 1997 1997
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ENG Algae, Fossil Analysis Coal Illinois Basin Paleobotany Spores (Botany), Fossil Torbanite Circular (Illinois State Geological Survey), 558 https://www.biodiversitylibrary.org/bibliography/61490 38209858 10.5962/bhl.title.61490 SPI