The relaxation time behavior for three macerals (vitrinite, fusinite, and resinite) of a subbituminous coal has been extensively characterized by13C solid state nor. Parameters studied included free radical concentrations.13C spin-lattice relaxation, T1C, cross polar1zation times, TCH, proton rotating frame spin-lattice relaxation. T1PH. dipolar dephasing times. T21, aromaticity, fa, and the effects of spinning sideband suppression on fa,. Large chemical shift variations among these samples were observed and assigned to various possible structural entities. Correlations between proximate and ultimate analyses and the nmr results, as well as comparisons with previously reported relaxation times are made.