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Published online by Cambridge University Press: 18 July 2016
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.
Publication authorized by the Director, U.S.Geological Survey