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NOAA/WDS Paleoclimatology archives a tree ring dataset from Pieterlen, Switzerland. The data provides parameters for dendrochronological analysis covering the period from 45 to -29 calendar years before present. NOAA National Centers for Environmental Information (NCEI) compiled and published this study, with a last update recorded in 1979.
Users must cite this study when using the data, as specified by the archive. The calendar year 'before present' (BP) convention requires understanding of its reference date (typically 1950 CE).