David E. Frazier / E. G. Wermund / Edgar H. Guevara / Keith Young / Leonard Franklin Brown / Myron Dorfman / Peter Tyrell Flawn / R. G. Rohrbacher / Robert A. Morton / University of Texas at Austin. Bureau of Economic Geology / William N. McAnulty / Charles A. Caughey / Leland J. Turk / Ralph Ottmar Kehle / Roberto García / William Lawrence Fisher / Carolyn H. Leach / Joseph F. Malina |