56th International School of Hydrocarbon Measurement;Norman,Oklahoma,April 14-16,1981 53d International School of Hydrocarbon Measurement;April 11-13,1978 International School of Hydrocabon Measurement,56th,12th,Montgomery,1981 International School of Hydrocabon Measurement,49th,Norman,1974 International School of Hydrocabon Measurement,50th,Norman,1975 International School of Hydrocabon Measurement,51st,Norman,1976 International School of Hydrocabon Measurement,52d,Norman,1977 International School of Hydrocabon Measurement,53d,Norman,1978 International School of Hydrocarbon Measurement(57th:1982:Norman,Okla) International School of Hydrocarbon Measurement(58th:1983:Norman,Okla)