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J. Warren Beck, David A. Richards, R. Lawrence Edwards, Bernard W. Silverman, Peter L. Smart, Douglas J. Donahue, Sofia Hererra-Osterheld, George. S. Burr, Leal Calsoyas, A. J. Timothy Jull, Dana Biddulph. 2001. Extremely Large Variations of Atmospheric 14C Concentration During the Last Glacial Period Science 292:2453