References: |
- 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.
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