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Tabulation of N2, O2, CO2, and He Concentrations in Soil Gases Collected on a Regular Basis for 11 Months from a Site at Tucson, Arizona

出版	U.S. Department of the Interior, U.S. Geological Survey, 1992
URL	http://books.google.com.hk/books?id=T4KKtgAACAAJ&hl=&source=gbs_api