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1
Day-to-day survival of late-instar western spruce budworm larvae and pupae /
di Campbell, Robert W.
Portland, Or. : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1984

Documento governativo Libro
2
Douglas-fir tussock moth : an annotated bibliography /
di Campbell, Robert W.
Portland Or. : Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1978

Documento governativo Libro
3
Bird exclosures for branches and whole trees /
[Portland, Or.] : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1981

Documento governativo Libro
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