TY  - BOOK
ED  - United States.
TI  - Maintenance of NAS enroute stage a air traffic control system
PY  - 1971///]
CY  - [Washington, D.C.
KW  - Air traffic control
N1  - [Handbook]; Dec. 6, 1968, and Changes 1-4, [1969-1971]; [Reprinted Oct. 4, 1971]; Cover title; 4to; [Reprint to include Changes. Issued with perforations]; CRDP Program Historic Shelflist record; Official use. Not available
ER  -