Contributions to Pennsylvanian paleobotany Mazocarpon oedipternum, sp. nov. and Sigillarian relationships,
Schopf, James Morton,
At head of title: State of Illinois, Dwight H. Green, governor. Dept. of registration and education, Frank G. Thompson, director. Division of the State geological survey, M.M. Leighton, chief, Urbana.
QE105 .A25 no.75
Illinois. State geological survey. Report of investigations no. 75