01642oam 2200505 450 991071688820332120210916120935.0(CKB)5470000002525300(OCoLC)1159597640(EXLCZ)99547000000252530020200623d1937 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierA sound pressure-level meter without amplification /by E.Z. StowellWashington, [D.C.] :National Advisory Committee for Aeronautics,1937.1 online resource (4 pages, 5 unnumbered pages) illustrationsTechnical note / National Advisory Committee for Aeronautics ;No. 629"December 1937."No Federal Depository Library Program (FDLP) item number.SoundMeasurementMeasuring instrumentsDecibelsDecibelsfastMeasuring instrumentsfastSoundMeasurementfastSoundMeasurement.Measuring instruments.Decibels.Decibels.Measuring instruments.SoundMeasurement.Stowell Elbridge Z.1393286United States.National Advisory Committee for Aeronautics,TRAALTRAALOCLCOOCLCFGPOBOOK9910716888203321A sound pressure-level meter without amplification3449263UNINA