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U.S. Geological Survey Open-File Report 03-041
Figure 7

Carbon isotopic composition of methane as a function of depth with samples color coded for stratigraphic sequence of the reservoir

Figure 7.  Carbon isotopic composition of methane as a function of depth with samples color coded for stratigraphic sequence of the reservoir.

U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/2003/of03-041/fig7.htm
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