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Tree ring width measurements from Ponderosa Pine (PSME) trees in Colorado, United States. The chronology spans 188 years, from 150 to -38 calendar years before present. This archived paleoclimatology study was produced by Graybill and Kassler and is maintained by NOAA National Centers for Environmental Information.
Data users are requested to cite the study. The 'last updated' metadata date is 1988-01-01, indicating the original publication date, not a recent revision.