Maintenance of NAS enroute stage A air traffic control system. 

 - [Washington, D.C.,  1968]. 
 - [366] p.  ill. 
<br/><br/> Handbook.  Dec. 6, 1968.  Cover title.  4to.  [Issued with perforations].  CRDP Program Historic Shelflist record. 
<br/><br/> Official use. Not available. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air traffic control.
<br/><br/><label>GPO Item No.: </label>0431-C-04 
<br/><br/><label>Gov. Doc. Class. No.: </label>TD 4.8/2:6100.1