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central states forest tree improvement conference 6th 1968 carbondale
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Ornamental tree and shrub improvement--the forester's role
Central States Forest Tree Improvement Conference (6th 1968 Carbondale, Ill. and Saint Louis, Mo.) · North Central Forest Experiment Station, U.S. Dept. of Agriculture--Forest Service
62 sayfa · 1968
Breeding / Congresses / Ornamental shrubs / Ornamental trees