TY  - SER
ED  - United States.
TI  - Radio navigational aids
T2  - H.O.
SN  - 9781626440715
PY  - 1941///-
CY  - Washington
PB  - U.S. G.P.O.
KW  - Radio in navigation
KW  - Directories
N1  - "Including details of direction finder stations, radiobeacons, navigational warnings, time signals, etc."
ER  -