Yazar
John S Hard
15 cilt bulundu.
John S. Hard · Pacific Northwest Forest and Range Experiment Station, Institute of Northern Forestry
19 sayfa · 1967
Forest insects / Forests and forestry
John S. Hard · Lake States Forest Experiment Station, U.S. Dept. of Agriculture
Sayfa sayısı yok · 1964
Red pine / Pine cones
John S. Hard · Lake States Forest Experiment Station, U.S. Dept. of Agriculture
Sayfa sayısı yok · 1963
Pine cones / Frost damage / Red pine
John S. Hard · Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture
Sayfa sayısı yok · 1971
Hemlock sawfly / Survival / Fertility / Larvae
John S. Hard · Lake States Forest Experiment Station, Forest Service, U.S. Department of Agriculture
10 sayfa · 1964
Red pine / Seeds / Identification / Pine / Diseases and pests
John S. Hard · Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
Sayfa sayısı yok · 1978
Aerial spraying and dusting in agriculture / Insecticides / Douglas-fir tussock moth
John S. Hard · Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service
32 sayfa · 1974
Forest ecology / Forest insects
John S. Hard · Dept. of Agriculture, Forest Service, Forest Products Laboratory
966 sayfa · 1976
Hemlock sawfly
John S. Hard · U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
21 sayfa · 1985
Control / Spruce / Spruce bark beetles / Diseases and pests
John S. Hard · U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
Sayfa sayısı yok · 1976
Hemlock sawfly
John S Hard · Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture
Sayfa sayısı yok · 1979
Control / Larch casebearer
John S. Hard · Forest Insect & Disease Management, USDA, Forest Service, Northern Region, State & Private Forestry
Sayfa sayısı yok · 1979
Control / Bacillus thuringiensis / Canker-worms / Siberian elm / Diseases and pests
John S. Hard · USDA Forest Service, Northern Region, State & Private Forestry
15 sayfa · 1980
Western spruce budworm / Effect of weather on / Conifers / Diseases and pests / Defoliation