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Tree ring width measurements from Douglas fir (Pseudotsuga menziesii) specimens collected at Silver Creek, Washington. The chronology spans 448 calendar years, from 411 to -37 years before present (BP). Data is archived by NOAA's National Centers for Environmental Information World Data Service for Paleoclimatology.
Time period is expressed in calendar years before present (BP), which requires understanding of the dating convention. Users are requested to cite the study when using the data.