TY  - RPRT
TI  - Coalification of organic matter in coal balls of the Pennsylvanian (upper Carboniferous) of the Illinois Basin, United States
AU  - Paul C. Lyons
AU  - Carolyn L. Thompson
AU  - Patrick G. Hatcher
AU  - F. W. Brown
AU  - M.A. Millay
AU  - Nikolaus Szeverenyi
AU  - G.E. Maciel
PY  - 1984
DO  - 10.1016/0146-6380(84)90010-x
UR  - https://pubs.usgs.gov/publication/70013850
ID  - 70013850
ER  -