--> Figure 1d. Status of USGS continuous gas assessments in 2007. Source: http://certmapper.cr.usgs.gov/data oga00 atl/graphic/2007/mean_cont_includ_cbm_07.pdf (accessed November 6, 2008)

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Figure 1d. Status of USGS continuous gas assessments in 2007. Source: http://certmapper.cr.usgs.gov/data/noga00/natl/graphic/2007/mean_cont_includ_cbm_07.pdf (accessed March 19, 2009)