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Tree ring width measurements from Nicollet Lake in Minnesota, USA, used for paleoclimate reconstruction. The chronology covers 244 years, from 223 to -21 calendar years before present. Data is archived by the NOAA National Centers for Environmental Information (NCEI) World Data Service for Paleoclimatology.
Time notation uses calendar years 'before present' (BP), where present is defined as 1950 CE. Users must cite the study when using the data.