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Tree ring width data from the Sheep Pen Canyon site in Colorado provides a 161-year chronology extending from 113 to -48 calendar years before present. This paleoclimatology dataset was archived by NOAA's National Centers for Environmental Information under its World Data Service. The data collection was last updated in 1998.
Users must cite the study when using the data, as per NOAA's request. The calendar years before present (BP) notation requires understanding of the dating convention (where 'present' is typically 1950).