TY  - RPRT
TI  - CHEMICAL STRUCTURES IN COAL: GEOCHEMICAL EVIDENCE FOR THE PRESENCE OF MIXED STRUCTURAL COMPONENTS.
AU  - Patrick G. Hatcher
AU  - Irving A. Breger
AU  - G.E. Maciel
AU  - N.M. Szeverenyi
PY  - 1983
UR  - https://pubs.usgs.gov/publication/70011238
ID  - 70011238
ER  -