Some Fern-like Fructifications and Their Spores from the Mazon Creek Compression Flora of Illinois (Pennsylvanian)

by Alan Martin Jacobs, Arthur Byron Leonard, Donald Clifford Bond, Gordon S. Fraser, Harold Bowen Willman, Hermann W. Pfefferkorn, Hubert M. Bristol, Illinois State Geological Survey, Ronald Arthur Landon, Theodore C. Labotka, William Hilton Johnson, Willis L. Busch, John C. Steinmetz, John Chapman Frye, John Paul Kempton, Richard David Harvey, Richard Henry Howard, Russel Allen Peppers, Paul C. Heigold, Tom Lee Phillips · 1971