TY  - GEN
TI  - AIR NAVIGATION
U1  - 629.5251 
PY  - 1962///
CY  - Washington
PB  - 
KW  - Navigation (Aeronautics)
KW  - U.S. Air Force -- Handbooks, Manuals, Etc
N1  - Air Force Manual No. 51-40a, V. 1
ER  -