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366 to -42 calendar years before present (BP) of tree ring data from a site in Washington, United States. The dataset contains parameters for tree ring analysis and is archived by the NOAA National Centers for Environmental Information under the World Data Service for Paleoclimatology. This paleoclimatology study was last updated in 1992.
Time period is expressed in calendar years before present (BP), where present is conventionally 1950 CE, requiring conversion for standard historical analysis. Users must cite the study when using the data.