TY  - BOOK
ED  - United States.
TI  - Maintenance of NAS enroute stage A air traffic control system, change 1
PY  - 1969///]
CY  - [Washington, D.C.
KW  - Air traffic control
N1  - Handbook; [Oct. 16, 1969]; 4to; [Cancellation date July 1, 1970. Issued with perforations]; CRDP Program Historic Shelflist record; Official use. Not available
ER  -