@article {73276,
	title = {Origin of Nitrogen-rich Natural Gases in the California Great Valley: Evidence from Helium, Carbon, and Nitrogen Isotope Ratios},
	journal = {Geochimica et Cosmochimica Acta},
	volume = {52},
	year = {1988},
	note = {Sacramento basin, San Joaquin basin; Mesozoic, Cenozoic},
	pages = {851-861},
	keywords = {California, carbon, Cenozoic, hydrocarbons, Mesozoic, natural gas, Sedimentary rocks},
	author = {Jenden, P. D. and Kaplan, I. R. and Poreda, R. J. and Craig, H.}
}
