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New Mexico tree ring data from the NOAA World Data Service for Paleoclimatology provides a chronology for Ponderosa Pine (PIPO). The data covers a period from 257 to -15 calendar years before present. This archived study was created by the NOAA National Centers for Environmental Information.
Users must cite this study when using the data. The calendar year -15 BP indicates a year 15 years before 1950 (the 'present' reference).