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The formulas for correcting 14 C measurements are explained. The expected ranges of the δ 13 C values for some types of samples are given. It is pointed out that the corrections are approximate because of the choice of correction formula, and that all samples arc normalized to wood samples instead of to carbon dioxide of the air. Some results from the Uppsala laboratory for plant materials and carbonates are given.
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Olsson et al. (1974) studied this question.
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