Relation of the carbon/oxygen ratio in coal to igneous intrusions in the Somerset coal field, Colorado : a study of the carbon-to-oxygen ratio in coals metamorphosed to higher than normal rank by igneous plutons / by John R. Dyni and David L. Gaskill.
Publication Info.
[Reston, Va.] : United States Department of the Interior, Geological Survey, 1980.
Washington : United States Government Printing Office