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368 calendar years of tree-ring data from Spain, covering the period from 341 to 27 BCE. The dataset was archived by NOAA's World Data Service for Paleoclimatology as part of the Schweingruber collection. It was last updated in the NOAA system in 1977.
Users must cite the study when using the data. The calendar year notation uses 'BP' (Before Present), where present is defined as 1950 CE.