Macro sample 42

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Radiocarbon Date

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References Cited

Merrill, W. L., R. J. Hard, J. B. Mabry, G. J. Fritz, K. R. Adams, J. R. Roney and A. C. MacWilliams
     2009     The diffusion of maize to the southwestern United States and its impact. Proceedings of the National Academy of Sciences USA 106(50):21019-21026.

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