Echo sounding and sonar for fishing.

Sonraí bibleagrafaíochta
Údar corparáideach:	Food and Agriculture Organization of the United Nations
Formáid:	LEABHAR
Teanga:	Béarla
Foilsithe / Cruthaithe:	Surrey, England Fishing News Books c1980.
Ábhair:	Sonar in fishing. Echo sounding > fishing.