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NOAA/WDS Paleoclimatology archives a tree-ring dataset from the Schweingruber - Wheelman - PIPO study, part of the International Tree-Ring Data Bank (ITRDB). The data provides a chronology for Ponderosa Pine (PIPO) in Colorado, USA, covering the period from 137 to -32 calendar years before present. This archived study was contributed by NOAA National Centers for Environmental Information (NCEI) and was last updated in 1982.
Users must cite this study when using the data, as per NOAA archive requirements. The calendar year 'BP' (Before Present) convention requires understanding of its specific reference date (typically 1950).