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1. EIA. Monthly Energy Review. (December 2005)
2. EIA. Electric Power Monthly. (December 2005)
3. EIA. Monthly Energy Review. (December 2005) |
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4. Baker Hughes. North American Rotary Rig Count. (January 2006)
5. EIA. Monthly Energy Review. (December 2005);
EIA. Natural Gas Annual 2004. (December 2005)
6. UBS. NatGas Insight. (January 13, 2006) |
