![Energy economics / International trade / OPEC / Calgary / Petroleum / Soft matter / Petroleum politics / Matter Energy economics / International trade / OPEC / Calgary / Petroleum / Soft matter / Petroleum politics / Matter](https://www.pdfsearch.io/img/4976c245fc04c2292d83037dfab78eab.jpg) Date: 2014-12-15 14:33:28Energy economics International trade OPEC Calgary Petroleum Soft matter Petroleum politics Matter | | Learning
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