00865nam a22002772  4500001001300000003000500013005001700018008004100035040001800076074001400094086002500108099002500133245007700158260003100235300002100266500001400287500002100301500000900322500006400331500004400395506003300439650002500472710005300497949001800550999001900568hsl001005360DGPO20170826152539.0170105s1969    dcu     r    f000 0 eng d  aGPOcGPOdMvI  a0431-C-020 aTD 4.8/2:6100.1/CH.1  aTD 4.8/2:6100.1/CH.100aMaintenance of NAS enroute stage A air traffic control system, change 1.  a[Washington, D.C.,c1969].  a[286] p. :bill.  aHandbook.  a[Oct. 16, 1969].  a4to.  a[Cancellation date July 1, 1970. Issued with perforations].  aCRDP Program Historic Shelflist record.  aOfficial use. Not available. 0aAir traffic control.1 aUnited States.bFederal Aviation Administration.  aBEVbFed Docs  c263972d263972