aeronautics in forestry Kitapları
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Seed distribution in the swath from helicopter sowing
George C. Edmunson
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Redmond Air Center
United States. Forest Service. Pacific Northwest Region
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Trends in airborne equipment for agriculture and other areas
Techno-economic Trends in Airborne Equipment for Agriculture and other Selected Areas of the National Economy (Conference) (1978 Warsaw)
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L'aérostation scientifique
Éric Faure
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