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Tree ring width measurements from a single ponderosa pine (PSME) in Mesa Verde, Colorado, spanning 563 years from 550 to -13 calendar years before present. The National Oceanic and Atmospheric Administration (NOAA) National Centers for Environmental Information archived this dendrochronological study, which was last updated in the database in 1963.
The time period uses calendar years 'before present' (BP), where present is conventionally 1950, requiring conversion for standard calendar analysis. Users must cite the study when using the data, per NOAA request.