Effects of leader topping and branch pruning on efficiency of Douglas-fir cone harvesting with a tree shaker /

Bibliographic Details
Main Author:	Copes, Donald L.
Corporate Author:	Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Format:	Government Document Book
Language:	English
Published:	[Portland, Or.] : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, [1985]
Series:	Research note PNW ; 431.
Subjects:	Conifers > Seeds > Harvesting. Douglas fir > Pruning.

Evans: US Documents (Annex 5th floor)