TY - RPRT TI - Notes on the origin of copromacrinite based on nitrogen functionalities and δ13C and δ15N determined on samples from the Peach Orchard coal bed, southern Magoffin County, Kentucky AU - Bruno Valentim AU - Manuel Algarra AU - Alexandra Guedes AU - Leslie F. Ruppert AU - James C. Hower PY - 2016 DO - 10.1016/j.coal.2016.05.004 UR - https://pubs.usgs.gov/publication/70154778 ID - 70154778 ER -