Reference | CARDENAS F., D., 1983, VOLCANIC STRATIGRAPHY AND URANIUM DEPOSITS OF CENTRAL SIERRA DE PENA BLANCA, CHIHUAHUA, MEXICO IN GEOLOGY AND MINERAL RESOURCES OF NORTH-CENTRAL CHIHUAHUA; GUIDEBOOK FOR THE 1983 FIELD CONFERENCE: EL PASO, TEXAS, EL PASO GEOLOGICAL SOCIETY, P. 325-334 |