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Ultra Petroleum Corp. is a publicly traded (AMEX - UPL), rapidly growing independent exploration and production company focused on its core properties, the Green River Basin of southwestern Wyoming in the Pinedale Anticline and Jonah Field and the shallow waters of Bohai Bay, China.
- Shell E&P is engaged in the upstream activities of acquiring, exploring, developing and producing oil and gas.
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Questar Corporation is a natural gas-focused energy company with four major lines of business conducted through three principal subsidiaries - Questar Market Resources (gas and oil exploration, development and production; gas gathering and processing); Questar Pipeline (interstate gas transportation and storage); and Questar Gas (retail gas distribution).
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