00839nam a2200253 k 4500001001500000005001500015008004100030035002000071040001900091043001200110049002100122052002500143086002400168110006600192245005000258260009400308300002500402440003900427490004200466500001900508500001500527650002200542963002100564WMF000192563  20201120171932840312s1983    us a          000   eng    a(OCoLC)10510592  aCBTcCBT/dGPO  an-us---0 lAV0000065286fXA06aTD 4.8/5b150/5020-2  aTD 4.8/5:150/5020-2  aUnited States.bFederal Aviation Administration0KAB20191397110aNoise assessment guidelines for new heliports  aWashington, D.C.:bU.S. Dept. of Transportation, Federal Aviation Administration,c[1983]  a18 p.:bill.;c28 cm00aAdvisory circular;vNo. 150/5020-210aAdvisory circular;vAC no. 150/5020-2  aCaption title.  a"12/9/83." 0aHeliportsxNoise.  aHeliportsaNoise