TY  - BOOK
AU  - Sonnenberg,Gerrit Jacobus
TI  - Radar and electronic navigation / 
SN  - 0408002727
U1  - 623.893 23
PY  - 1978///.
CY  - London ; , Boston : 
PB  - Newnes-Butterworths, 
KW  - Electronics in navigation.
ER  -