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Supertopics:
USA's Petroleum
Colorado

Colorado's Fossil Fuels

Subtopics:
webLaura ZuckermanReuters2014-10-29
webTamara AudiWall Street Journal2014-09-15
webKirk JohnsonNew York Times2011-08-23
webBrian BienkowskiEnvironmental Health News2014-01-31
webLisa M. McKenzie, Ruixin GuoEnviron Health Perspect2014-04-01
webAbrahm LustgartenProPublica2008-12-21