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| Petroleum industry and trade -- Mexico. (2) |
| Petroleum law and legislation -- Mexico. (2) |
| Energy policy -- Mexico. (1) |
| Petróleos Mexicanos. (1) |
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| Petroleum industry and trade -- Mexico. (2) |
| Petroleum law and legislation -- Mexico. (2) |
| Energy policy -- Mexico. (1) |
| Petróleos Mexicanos. (1) |