TY  - RPRT
TI  - Organic matter in a coal ball: Peat or coal?
AU  - Patrick G. Hatcher
AU  - P.C. Lyons
AU  - C.L. Thompson
AU  - F. W. Brown
AU  - G.E. Maciel
PY  - 1982
DO  - 10.1126/science.217.4562.831
UR  - https://pubs.usgs.gov/publication/70011452
ID  - 70011452
ER  -