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Tree ring width data from Scots pine on Valaam Island, Russia, spans 277 years from 235 to -42 calendar years before present. The dataset was archived by NOAA's World Data Service for Paleoclimatology and last updated in 1992. It is part of the International Tree-Ring Data Bank, contributed by researcher Schweingruber.
Time notation uses calendar years before present (BP), where 0 BP is conventionally 1950 CE. Requires understanding of dendrochronological data formats for analysis. Citation of the original study is requested.