TY  - BOOK
ED  - United States.
TI  - Importance of transponder operation & altitude reporting
PY  - 1900///?]
CY  - [Washington, D.C.
KW  - Transponders
KW  - Airplanes
KW  - Radio equipment
KW  - Altitudes
N1  - CRDP Program Historic Shelflist record
ER  -