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Tree ring width measurements from the Schweingruber collection provide a proxy climate record for Quebec, Canada. The chronology covers 240 years, from 202 to -38 calendar years before present. The dataset was archived by NOAA's National Centers for Environmental Information and last updated in 1988.
Time notation uses calendar years before present (BP), where present is 1950 CE; negative values indicate years after 1950. Users must cite the original study per NOAA requirements.