RS-10 Proceedings of the Fourth Symposium on the Geology of Rocky Mountain Coal RS-10 Proceedings of the Fourth Symposium on the Geology of Rocky Mountain Coal, 1980
RS-08 Proceedings of the Fifteenth Forum on Geology of Industrial Minerals-Industrial Minerals in Colorado and the Rocky Mountain Region RS-08 Proceedings of the Fifteenth Forum on Geology of Industrial Minerals: Industrial Minerals in Colorado and the Rocky Mountain Region
RS-04 Proceedings of the Second Symposium on the Geology of Rocky Mountain Coal RS-04 Proceedings of the Second Symposium on the Geology of Rocky Mountain Coal, 1977
RS-01 Geology of Rocky Mountain Coal: A Symposium RS-01 Geology of Rocky Mountain Coal: A Symposium, 1976