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Marine Acoustics Laboratory of IO PAS Three frequencyechosounder (60, 120, 210 kHz) working from r/v Oceania . • Acoustical classification ... methods of gas bubbles detection (trapped in bottom sediments) V-fin body & three frequencyechosounder onboard r/v Oceania . • Acoustical study of hydrodynamical processes - noise generated ... www.iopan.gda.pl