TY  - BOOK
ED  - United States.
TI  - Maintenance of NAS enroute stage A air traffic control system
PY  - 1968///]
CY  - [Washington, D.C.
KW  - Air traffic control
N1  - Handbook; Dec. 6, 1968; Cover title; 4to; [Issued with perforations]; CRDP Program Historic Shelflist record; Official use. Not available
ER  -