from Mann et al (1999) “Northern hemisphere temperatures during the past millennium: Inferences, uncertainties, and limitations”. Geophysical Research Letters 26 (6): 759.
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from Mann, Michael E.; Bradley, Raymond S.; Hughes, Malcolm K. (1999). “Northern hemisphere temperatures during the past millennium: Inferences, uncertainties, and limitations”. Geophysical Research Letters 26 (6): 759.
