Echo sounding and sonar for fishing.

ग्रंथसूची विवरण
निगमित लेखक:	Food and Agriculture Organization of the United Nations
स्वरूप:	पुस्तक
भाषा:	अंग्रेज़ी
प्रकाशित:	Surrey, England Fishing News Books c1980.
विषय:	Sonar in fishing. Echo sounding > fishing.