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100   $a19910821j197305    ua             0
101 0 $aeng
135   $aur|||||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aMeasured and calculated transmission losses of sound waves through a helium layer /$fby Thomas D. Norum
210  1$aWashington, D.C. :$cNational Aeronautics and Space Administration,$dMay 1973.
215   $a1 online resource (23 pages) $cillustrations
225 1 $aNASA/TN ;$vD-7230
300   $a"May 1973."
320   $aIncludes bibliographical references (page 14).
606   $aHelium$2nasat
606   $aJet nozzles$2nasat
606   $aSound-waves
606   $aAcoustic impedance$xMaterials$xTesting
606   $aHelium$2fast
606   $aJet nozzles$xNoise$2fast
606   $aSound-waves$2fast
615  7$aHelium.
615  7$aJet nozzles.
615  0$aSound-waves.
615  0$aAcoustic impedance$xMaterials$xTesting.
615  7$aHelium.
615  7$aJet nozzles$xNoise.
615  7$aSound-waves.
700   $aNorum$b Thomas D.$01391071
712 02$aUnited States.$bNational Aeronautics and Space Administration,
712 02$aLangley Research Center.
801  0$bABC
801  1$bABC
801  2$bAD#
801  2$bOCLCE
801  2$bOCLCQ
801  2$bOCLCO
801  2$bOCLCQ
801  2$bOCLCF
801  2$bGPO
906   $aBOOK
912   $a9910716676903321
996   $aMeasured and calculated transmission losses of sound waves through a helium layer$93480159
997   $aUNINA