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92-year tree ring width chronology from fir trees in Illiswil, Switzerland, capturing environmental conditions from 63 to 29 BCE. The dataset was archived by NOAA's World Data Service for Paleoclimatology and is associated with the Schweingruber collection. This record was last updated in the NOAA system in 1979.
Users must cite the original study when using the data, as per NOAA requirements. The 'last updated' date reflects NOAA system metadata, not new data collection; the original study is from 1979 or earlier.