Botanical Aspects of Pollen and Seed Collection
According to various authors of articles published in recent years, the first artificial hybridization of pine species is said to have been accomplished and reported by a German worker about 100 years ago. Dr. J. W. Duffield has informed me that he had the opportunity recently to consult the original article reporting this work, and his translation turned up a most interesting and significant point.
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Author(s): Scott S. Pauley
Publication: Tree Improvement and Genetics - Lake States Forest Tree Improvement Conference - 1955