TY - RPRT TI - The origin and distribution of HAPs elements in relation to maceral composition of the A1 lignite bed (Paleocene, Calvert Bluff Formation, Wilcox Group), Calvert mine area, east-central Texas AU - Sharon S. Crowley AU - Peter D. Warwick AU - Leslie F. Ruppert AU - James Pontolillo PY - 1997 DO - 10.1016/s0166-5162(97)00029-3 UR - https://pubs.usgs.gov/publication/70019404 ID - 70019404 ER -