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26 flat 37 flat 7-5 kilocycles acoustic impedance anomaly curve drops anomaly plot Attn average value BAHIA TODOS SANTOS bottom acts BOTTOM AT BAHIA bottom is described bottom types Bureau of Ships C. W. Horton CALIFORNIA C. W. Camp and Eckart Chief Code cycles per second data at 7-5 db db yds Defense Laboratory DEFENSE RESEARCH LABORATORY described as sand dropa drops after 1,000 Eckart introduce Electric Company erratic fit the transmission fluctuations in data frequency of 200 Hydrographic hydrophone large fluctuations long run Lover California Naval Research Laboratory Navy Electronics Laboratory Navy Mine Defense OCEAN BOTTOM Oceanography Office of Naval physical parameters poor data range Report UCDWR restrictions run number sound transmission Summary of calculations transmission anomalies transmission data transmission runs types and water U.S. Naval Ordnance U.S. Naval Research U.S. Navy Electronics Underwater Sound uniform data University of California velocity of sound water depth yards