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Schweingruber's tree-ring chronology from Cortina d'Ampezzo, Italy, provides a 238-year record of annual growth variations. The data, archived by NOAA's World Data Service for Paleoclimatology, covers the period from 213 BC to AD 25. This study was published in 1975.
Time period is expressed in calendar years before present (BP); requires conversion for standard historical dating. Users must cite the study when using the data.