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           [Folletos sobre aeronáutica ] Moscow , 1939 . 4 folletos . 15 cm . Contiene : no. 1 Across the North pole to America por M . Gromov .- no. 3 . Parachute-Jumping and gliding popular Soviet sports por Y . Moschkovsky . -no 4 . Moscow-North Pole.Vancouver , Wash . por M . Vodopyanov .