http://pec.lib.wvu.edu/record/P10501975Gasification of caking-type bituminous coal at 75 to 150 PSIG in a stirred-bed gas producer. Government document. "MERC/TPR-75/3." Issued by: United States Energy Research and Development Administration, Office of Public Affairs, Technical Information Center.Libertore, Arthur J.Friggens, Gary R.Rahfuse, Robert V.Coal gasification.Bituminous coal.14256