Guidelines for the operational use of Bacillus thuringiensis against the spruce budworm /

by Morris, Oswald N.
[Washington, D.C.?] : U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service, 1984

The development of the clover mite (Bryobia praetiosa, Koch, tetranychidae) in relation to the nitrogen, phosphorus, and potassium nutrition of its host /

by Morris, Oswald N.
1960

Guidelines for the operational use of Bacillus thuringiensis against the spruce budworm /

by Morris, Oswald N.
[Washington, D.C.?] : U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service, 1984

Spruce budworms handbook : regional evaluation of B.t. for spruce budworm control /

by Grimble, David G., Morris, Oswald N.
Washington, D.C. : U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service, 1983