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Pacific Northwest Research Station

https://www.fs.usda.gov/pnw/publications/1912-douglas-fir-heredity-study-long-term-effects-climatic-transfer-distance-growth-0
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https://www.fs.usda.gov/pnw/publications/1912-douglas-fir-heredity-study-long-term-effects-climatic-transfer-distance-growth-0