S variable H2 O variable He trace 70. Peebles, M.W.H., 1980, Evolution of the Gas Industry: New York, New York University Press, 235 p. 71. Energy Information Administration Office of Energy Markets and End Use, 2009, Annual Energy Review 2008: U.S. Dept. of Energy, Energy Information Administration, Rept. DOE/EIA-0384(2008), June, 407 p. Available online at http://www.eia.doe.gov/aer. ©2010 Potential Gas Committee Natural Gas Primer • 193 Where does our natural gas come…
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