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Genetics of eastern cottonwood (IA geneticsofeaster11schr)

https://commons.wikimedia.org/wiki/File:Genetics_of_eastern_cottonwood_(IA_geneticsofeaster11schr).pdf

Research paper WO Volume WO-11 Publisher [Washington, U.S. Govt. Print. Off] Description Issued Apr. 1971. Bibliography: p. 15-19 Subjects: Language English

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Genetics of ponderosa pine (IA geneticsofponder34wang)

https://commons.wikimedia.org/wiki/File:Genetics_of_ponderosa_pine_(IA_geneticsofponder34wang).pdf

Chi-wu Title Genetics of ponderosa pine Series title Research paper WO Volume WO-34 Publisher [Washington] : U.S. Dept. of Agriculture, Forest Service

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Genetics of sugar maple (IA geneticsofsugarm07krie)

https://commons.wikimedia.org/wiki/File:Genetics_of_sugar_maple_(IA_geneticsofsugarm07krie).pdf

William J. cn Title Genetics of sugar maple Series title Research paper WO Volume WO-7 Publisher [Washington, D.C.] : U.S. Department of Agriculture Description