Showing 1 - 3 of 3 for search: 'Mason, Richard R.', query time: 0.05s
by Mason, Richard R.
Published: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1993
Description: 12 pages : illustrations ; 28 cm.
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Published: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1998
Description: 25 pages : illustrations, maps ; 28 cm.
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Rev. Jan. 1981.
by Wickman, Boyd E.
Published: U.S. Dept. of Agriculture, Forest Service, 1981
Description: 10 pages : color illustrations, 1 map ; 23 cm.
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Douglas fir tussock moth Douglas fir Diseases and pests Forest soils Fertilization Western spruce budworm