2006. Sen, Colleen. Relief shown by shading. LNG trade routes are indicated. "December 2006." Includes graphs showing: "Global LNG trade." Tables of economic statistic... Houston, Tex. : Oil & Gas Journal, 2006.
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2003. Petroleum Economist Cartographic (Firm). Relief shown by gradient tints. Depths shown by gradient tints. Includes tables showing gas reserves and production by country and by region for 20... London : Petroleum Economist Ltd., 2003.