TY  - BOOK
AU  - Helfrick, Albert D.
TI  - Modern Aviation Electronics 
SN  - 013097692X
U1  - 629.135 
PY  - 1994///
CY  - Englewood Cliffs, Nj : 
PB  - Prentice Hall Career and Technology, 
KW  - Avionics
N1  - NY
UR  - https://eaklibrary.neduet.edu.pk:8443/catalog/bk/books/toc/0-13-097692-X.pdf
ER  -