TY  - BOOK
AU  - Tucker, D. G.
TI  -  Underwater observation using sonar
U1  - 534.23 
PY  - 1966///
CY  - London
PB  - Fishing news Book Ltd
KW  -  Getting  Information  under water
KW  - Acoustic waves Beams and Echoes
KW  - Principles of simple sonar systems
KW  - Typical sonar designs
ER  -