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Thomson, C. Wyville. 1873. Depths of the Sea : an account of the General Results of the Dredging Cruises of H.M.SS. 'Porcupine' and 'Lightning' During the Summers of 1868, 1869, and 1870 under the Scientific Direction of Dr. Carpenter, F.R.S., J.Gwyn Jeffreys, F.R.S., and Dr. Wyville Thomson, F. R. S. London, England : MacMillan and Co.; Fig. 6

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