01129nam 2200349Ia 450 991069805730332120090212155116.0(CKB)5470000002394429(OCoLC)303637028(EXLCZ)99547000000239442920090212d1987 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierThe influence of beards on oxygen mask efficiency[electronic resource][Washington, D.C.] :U.S. Dept. of Transportation, Federal Aviation Administration,[1987]3 pages digital, PDF fileAdvisory circular ;AC no. 120-43Title from PDF caption (viewed Feb 12, 2009)."1/27/87."AirplanesOxygen equipmentEffectivenessBeardsAirplanesOxygen equipmentEffectiveness.Beards.GPOGPOBOOK9910698057303321The influence of beards on oxygen mask efficiency3473347UNINA