Email Record: Metodika provedenii︠a︡ polevykh opytov i issledovaniĭ po razrabotke tekhnologii aviat︠s︡ionnykh rabot v selʹskom khozi︠a︡ĭstve i agronomicheskoĭ ot︠s︡enke aviat︠s︡ionnoĭ selʹskhozapparatury /