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richard i washburn
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Cilt sonuçları
White fir needle miner
Richard I. Washburn · U.S. Dept. of Agriculture, Forest Service
Sayfa sayısı yok · 1974
Fir / Diseases and pests / Epinotia meritana
Electronic recorder as aid in aerial insect surveys
Richard I. Washburn · Intermountain Forest and Range Experiment Station
Sayfa sayısı yok · 1956
Equipment and supplies / Dictating machines / Aerial surveys in forestry
An aerial test of Orthene against the larch casebearer
Richard I. Washburn · Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station
Sayfa sayısı yok · 1977
Control / Larch casebearer