--> Figure 1b. Status of USGS conventional oil assessments in 2008. Source: http://certmapper.cr.usgs.gov/data oga00 atl/graphic/2008/total_oil_mean_08.pdf (accessed November 6, 2008)

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Figure 1b. Status of USGS conventional oil assessments in 2008. Source: http://certmapper.cr.usgs.gov/data/noga00/natl/graphic/2008/total_oil_mean_08.pdf (accessed March 19, 2009)