00700nam a22002172  4500001001300000003000500013005001700018008004100035040001800076086002700094099002700121245009100148260003100239300000700270500001400277500004400291650005700335710005300392949001800445999001900463hsl001005323DGPO20170826152539.0170105s1977    dcu     r    f000 0 eng d  aGPOcGPOdMvI0 aTD 4.8/2:6032.1 A/CH.1  aTD 4.8/2:6032.1 A/CH.100aModifications to ground facilities, systems, & equipment in the natl. airspace system.  a[Washington, D.C.,c1977].  av.  a12/27/77.  aCRDP Program Historic Shelflist record. 0aAir traffic controlzUnited StatesxData processing.1 aUnited States.bFederal Aviation Administration.  aBEVbFed Docs  c263960d263960