TY  - GEN
AU  - Helfrick, Albert 
TI  - Principles of avionics
SN  - 9781885544353
PY  - 2015///
CY  - Leesburg
PB  - Avionics Communications
KW  - AIRPLANES-Electronic equipment
KW  - AVIONICS
KW  - Radion in navigation
ER  -