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145 calendar years of tree ring data, from 100 to -45 years before present, provide a proxy record for historical climate conditions. The dataset contains parameters from tree rings, archived by the NOAA National Centers for Environmental Information under its World Data Service for Paleoclimatology. This study was last updated in 1995.
Users must cite this specific study when using the data, as required by the archive. The 'before present' (BP) time convention requires understanding for correct temporal interpretation.