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Tree ring width data from Saganaga Lake in Minnesota, USA, provides a paleoclimate record. The chronology covers 345 years, from 307 to -38 calendar years before present. The dataset was archived by NOAA NCEI's World Data Service for Paleoclimatology, with a last recorded update in 1988.
The 'time period coverage' is expressed in calendar years before present (BP), which requires understanding of the BP dating convention. Users must cite the study when using the data, as per NOAA's request.