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U.S. crude oil, natural gas, and natural gas liquids reserves ... annual report
중앙도서관 대출불가(별치) 
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United States United States Office of the Oil and Gas Information System Energy Information Administration. Office of Oil and Gas
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Office of the Oil and Gas Information System: Available from the Supt. of Docs, U.S. G.P.O.
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1979-
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