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The 2-L counter (GSC I) and the 5-L counter (GSC IV) were operated routinely during the past year. The 5-L counter was operated at 1 atm, except for February-March 1967, when it was operated at 4 atm. Approximately half the determinations reported were obtained from each counter.doi:10.1017/s0033822200010894 fatcat:ovrgsmaspnhornjtjbjerpj6y4