TY  - RPRT
TI  - An in situ occurrence of coal balls in the Amburgy coal bed, Pikeville Formation (Duckmantian), central Appalachian Basin, USA
AU  - Stephen F. Greb
AU  - Cortland F. Eble
AU  - D.R. Chesnut
AU  - T.L. Phillips
AU  - James C. Hower
PY  - 1999
DO  - 10.2307/3515395
UR  - https://pubs.usgs.gov/publication/70021282
ID  - 70021282
ER  -