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a l orr ewing
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A clone bank of Douglas fir
A. L. Orr-Ewing · Forest Service, Dept. of Lands, Forests and Water Resources
13 sayfa · 1969
Douglas fir / Forests and forestry / Reproduction
A progeny test of Douglas-fir to demonstrate the importance of selection in forest practice
A. L. Orr-Ewing · Forest Service, Dept. of Lands, Forests and Water Resources
23 sayfa · 1967
Plants / Douglas fir / Reforestation / Variation
Survival and growth traits of racial crosses with Douglas fir
A. L. Orr-Ewing · Province of British Columbia, Ministry of Forests
46 sayfa · 1978
Breeding / Douglas fir