TY - RPRT TI - Chemical structures of coal lithotypes before and after CO2 adsorption as investigated by advanced solid-state 13C nuclear magnetic resonance spectroscopy AU - X. Cao AU - Maria Mastalerz AU - M.A. Chappell AU - L.F. Miller AU - Y. Li AU - J. Mao PY - 2011 DO - 10.1016/j.coal.2011.08.003 UR - https://pubs.usgs.gov/publication/70034363 ID - 70034363 ER -