TY  - RPRT
TI  - A geostatistical approach to predicting sulfur content in the Pittsburgh coal bed
AU  - W.D. Watson
AU  - L.F. Ruppert
AU  - L. J. Bragg
AU  - S.J. Tewalt
PY  - 2001
DO  - 10.1016/s0166-5162(01)00035-0
UR  - https://pubs.usgs.gov/publication/70023453
ID  - 70023453
ER  -