00878nam a22002772  4500001001300000003000500013005001700018008004100035040001800076074001400094086002200108099002200130245005900152260003100211300002700242500001800269500001700287500000900304500005800313500004100371500004400412650005400456710005300510949001800563999001900581hsl001005292DGPO20170826152539.0170105s1970    dcu     r    f000 0 eng d  aGPOcGPOdMvI  a0431-C-040 aTD 4.8/2:6000-7 B  aTD 4.8/2:6000-7 B00aImprovement of operating conditions TRACON facilities.  a[Washington, D.C.,c1970].  a[2], ii, 51 p. :bill.  aJune 9, 1970.  aCover title.  a4to.  a[Issued with perforations. Cancels handbook 6000-7A].  aDistribution made by issuing office.  aCRDP Program Historic Shelflist record. 0aRadar air traffic control systemszUnited States.1 aUnited States.bFederal Aviation Administration.  aBEVbFed Docs  c263952d263952