00924nam a22002892  4500001001300000003000500013005001700018008004100035040001800076086002200094099002200116245006700138260003100205300002600236500001600262500004800278500003000326500001700356500000900373500006000382500004400442506003300486650002500519710005300544949001800597999001900615hsl001005363DGPO20170826152539.0170105s1971    dcu     r    f000 0 eng d  aGPOcGPOdMvI0 aTD 4.8/2:6100.1/2  aTD 4.8/2:6100.1/200aMaintenance of NAS enroute stage a air traffic control system.  a[Washington, D.C.,c1971].  axxxvi, 790 p. :bill.  a[Handbook].  aDec. 6, 1968, and Changes 1-4, [1969-1971].  a[Reprinted Oct. 4, 1971].  aCover title.  a4to.  a[Reprint to include Changes. Issued with perforations].  aCRDP Program Historic Shelflist record.  aOfficial use. Not available. 0aAir traffic control.1 aUnited States.bFederal Aviation Administration.  aBEVbFed Docs  c263974d263974