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NOAA's Paleoclimatology archive provides a 181-year tree-ring chronology from the Fort Simpson region in Canada's Northwest Territories. The data, collected by researcher Schweingruber, covers the period from 143 to -38 calendar years before present. This dataset is part of the International Tree-Ring Data Bank and was archived by NOAA NCEI in 1988.
Time notation uses 'calendar years before present (BP)', where present is conventionally 1950 CE, requiring conversion for standard timelines. Users must cite the original study per NOAA requirements.