TY - RPRT TI - Thermal-maturity limit for primary thermogenic-gas generation from humic coals as determined by hydrous pyrolysis AU - Michael Lewan AU - M.J. Kotarba PY - 2014 DO - 10.1306/06021413204 UR - https://pubs.usgs.gov/publication/70181780 ID - 70181780 ER -