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NOAA/WDS Paleoclimatology archives a tree-ring chronology dataset from Niwot Ridge, Colorado. The data covers 288 years, from 256 to -32 calendar years before present (BP), for dendroclimatic analysis. This archived study was last updated in 1982.
Users must cite this study when using the data, as specified by the archive. The calendar year notation includes negative values (-32 BP), which requires careful interpretation of the timeline.