| Reference | {Deposit:: R & D MEXICO, APRIL 30, 1982.}{Deposit:: ENGINERRING AND MINING JOURNAL, NOVEMBER, 1980}{Deposit:: INDUSTRIAL MINERALS AND ROCKS, FOURTH EDITION, 1975.}{Deposit:: SME MINING ENGINEERING HANDBOOK, VOL.2, 1973.}{Reserve-Resource:: BRITISH SULPHUR, WORLD SURVEY OF SULPHUR RESOURCES, SECOND}{Reserve-Resource:: EDITION, 1974 PAGE ?; AND THIRD EDITION, PAGE 45.} |