Yazar
Torolf R Torgersen
6 cilt bulundu.
Torolf R. Torgersen · U.S. Dept. of Agriculture, Forest Serivce, Pacific Northwest Region
Sayfa sayısı yok · 1995
Beneficial birds / Control / Insect pests / Forest protection
Torolf R Torgersen · Dept. of Agriculture : for sale by the Supt. of Docs., U.S. Govt. Print. Off.
11 sayfa · 1979
Control / Douglas fir tussock moth / Douglas-fir tussock moth
Torolf R. Torgersen · U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
38 sayfa · 1981
Douglas-fir tussock moth / Diseases and pests / Douglas fir / Fir
Torolf R Torgersen · Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
28 sayfa · 1977
Identification / Parasitic insects / Douglas-fir tussock moth / Parasites
Torolf R. Torgersen · Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture
Sayfa sayısı yok · 1967
Hemlock looper / Sitka spruce / Diseases and pests