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US Geological Survey, Denver, Colorado Radiocarbon Dates II*
Published online by Cambridge University Press: 18 July 2016
Extract
This list includes all measurements made between 1969 and 1973 that represent natural samples. Physical and chemical treatment of samples and counting technique remain as previously reported (R, 1973, v 15, p 469-478). Calculations of dates are made with the radiocarbon half-life of 5568 ± 30 years; plus or minus numbers quoted herein are the standard errors for the counting of radioactive disintegrations.
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