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BP Statistical Review of World Energy 2007; US Department of Energy Information Administration (EIA), International Energy Annual 2004, 2006; EIA, System for the Analysis of Global Energy Markets, 2007; World Energy Council, Survey of Energy Resources 2004; Coaltrans World Coal Map 2005; International Energy Agency; OECD Glossary of Statistical Terms, 2008; Atlas Environnement du Monde Diplomatique 2007; Colin Campbell, Association for the study of peak oil and gas, 2007.