TY  - RPRT
TI  - Did the Middlesboro, Kentucky, bolide impact event influence coal rank?
AU  - J.C. Hower
AU  - S.F. Greb
AU  - K.W. Kuehn
AU  - C.F. Eble
PY  - 2009
DO  - 10.1016/j.coal.2009.05.003
UR  - https://pubs.usgs.gov/publication/70036483
ID  - 70036483
ER  -