| Reference | {Deposit:: ENGINEERING AND MINING JOURNAL. PENA COLORADO: STRIPPING}{Deposit:: RATIOS RISING. NOV., 1980, PP. 89-90.}{Deposit:: ENGINEERING AND MINING JOURNAL. MEXICO- GROWING INDUSTRY}{Deposit:: WILL TAP EXTENSIVE RESOURCES. NOV., 1974, PP. 98,}{Deposit:: 158-159.}{Deposit:: U. S. DEPARTMENT OF STATE. AIRGRAM A-10. OCT. 10, 1981,}{Deposit:: 16 PP.}{Deposit:: U. S. DEPARTMENT OF STATE. AIRGRAM A-16. DEC. 14, 1981,}{Deposit:: 5 PP.}{Deposit:: WHITE, L. (MANAGING EDITOR). MINING IN MEXICO: FEEDING}{Deposit:: NEEDED RAW MATERIALS TO A RAPIDLY EXPANDING ECONOMY.}{Deposit:: ENGINEERING AND MINING JOURNAL. NOV. 1980, PP. 62-68.} |