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Tree ring width measurements from the Devil's Lake State Park in Wisconsin, United States. The chronology covers a 340-year period from 308 to -32 calendar years before present. This paleoclimatology study is archived and provided by NOAA National Centers for Environmental Information.
Time notation uses 'calendar years before present (BP)', where present is defined as 1950 CE; negative values indicate years after 1950. Users must cite the original study.