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Weems, G.W.; Miller, N.L., Compressibility Factors for Helium and Carbon Dioxide Mixtures at 0 deg, 10 deg, 20, deg, 23 deg, and 35 deg C ant To 900 PSIA, U. S. Bur. Minees Report of Investigation No. 7233 TN23.U7 1969 1969, 1969. [all data]