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_aTucker, D. G. _915999 |
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| 245 | _a Underwater observation using sonar | ||
| 653 |
_a Getting Information under water _aAcoustic waves Beams and Echoes _aPrinciples of simple sonar systems _aTypical sonar designs |
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| 942 | _cBK | ||
| 942 | _cBK | ||
| 260 |
_aLondon _bFishing news Book Ltd _c1966 |
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_c73621 _d73621 |
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