TY  - BOOK
ED  - United States.
TI  - U.S. national aviation standard for the VHF air-ground communications system
PY  - 1977///]
CY  - [Washington, D.C.
KW  - Air traffic control
KW  - Communication systems
N1  - 11/11/77; CRDP Program Historic Shelflist record
ER  -