This list contains the results of measurements madeduring 1965 and 1966. Samples are counted in theform of acetylene gas, as previously, and agescomputed on the basis of the Libby half-life, 5568 ±30 yr. The error listed is always larger than theone-sigma statistical counting error commonly used,takes into account known uncertainty laboratoryfactors, but does not include external (field oratmospheric) variations.