TY  - BOOK
AU  - birch,N .H
AU  - bramson,A .E
TI  - radio aids to air navigation / 
T2  - flight briefing for pilots ; 3
U1  - 629.13252/bir 
PY  - 1978///
CY  - london
PB  - pitman
KW  - airplanes
KW  - piloting
ER  -