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*UNDERWATER SOUND Acoustic Detection and Detectors NORTH ATLANTIC OCEAN SIGNAL TO NOISE RATIO *AMBIENT NOISE *BISCAY BAY *DATA PROCESSING *HYDROPHONES *SQUARE DEAL PROJECT A 176 VESSEL ARRAYS AZIMUTH Acoustics BEAM FORMING BEARING(DIRECTION) CALIBRATION COHERENCE COMPUTER PROGRAMS CORRELATION TECHNIQUES DATA ACQUISITION DATA PROCESSING DATA REDUCTION DEEP WATER DIGITAL RECORDING SYSTEMS Electrical and Electronic Equipment GEOPHYSICS HYDROGRAPHIC SURVEYING LONG RANGE ACOUSTIC PROPAGATION PROJECT LOW FREQUENCY MAGNETIC TAPE