2005 world book, Chicago
http://www.tonto.eie.doe.gove/kids/index.cfm
Elementary Energy Info book Thomson Bob Massachusetts Need project 2004
http://www.ask.com/web?q=coal&qsrc=0&o=0&l=dir
http://www.ask.com/web?q=petroleum&qsrc=0&o=0&l=dir
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