International Union Seed Source Studies of Scotch Pine and Norway Spruce
For many years racial variation of forest trees has been a challenge to foresters in Europe where trees have been planted extensively for a couple of centuries. Studies dating back more than 100 years have enabled European foresters to improve management practices in several respects.
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Author(s): Hans Nienstadet
Publication: Tree Improvement and Genetics - Lake States Forest Tree Improvement Conference - 1964