TY - RPRT TI - Abundances of polycyclic aromatic hydrocarbons (PAHs) in 14 chinese and american coals and their relation to coal rank and weathering AU - R. Wang AU - Gaisheng Liu AU - Jiahua Zhang AU - C. L. Chou AU - J. Liu PY - 2010 DO - 10.1021/ef1010622 UR - https://pubs.usgs.gov/publication/70037517 ID - 70037517 ER -