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Gas, Natural: A combustible, gaseous mixture of low-molecular weight Paraffin hydrocarbons, generated below the surface of the earth. It contains mostly Methane and Ethane with small amounts of Propane; Butanes; and higher hydrocarbons, and sometimes Nitrogen; Carbon dioxide; Hydrogen sulfide; and Helium. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
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