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[48] Mann, M. E., Z. H. Zhang, M. K. Hughes, R. S. Bradley, S. K. Miller, S. Rutherford, and F. B. Ni. "Proxy-based Reconstructions of Hemispheric and Global Surface Temperature Variations over the Past Two Millennia." Proceedings of the National Academy of Sciences of the United States of America 105, no. 36 (2008): 13252-13257. Abstract