U.S. Geological Survey Open-File Report 03-041
Figure 9
Figure 9. The carbon and hydrogen isotopic composition of methane with fields labeled according to Schoell (Schoell, 1983) .
U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/2003/of03-041/fig9.htm
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