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Tree ring width measurements from the Pearl - Walpole Cedar Swamp in Massachusetts, USA, used for paleoclimate reconstruction. The chronology covers the period from 77 to -65 calendar years before present. The dataset is archived by the NOAA National Centers for Environmental Information's World Data Service for Paleoclimatology and was last updated in 2015.
Users must cite the original study when using the data. The time period includes negative years before present, which requires careful interpretation of the dating convention.