. Effects of noise of offshore oil and gas operations on marine mammals : an introductory assessment. Offshore oil industry; Gas well drilling; Noise pollution. KILLER WHALE. SEA OnER Brown or Block 6-8 tt long "Bark". Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gales, R. S; Naval Ocean Systems Center (U. S. ); United States. Bureau of Land Management. San Diego, Calif. : Naval Ocean Systems Center

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