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Nature, Vol. 216, No. 5122. (30 December 1967), pp. 1274-1276, doi:10.1038/2161274a0 Key: citeulike:12077175
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Seals and porpoises in Scotland and Canada, far from the sites of application of pesticides, can accumulate high concentrations of residues in their blubber. These chemicals are spreading through the long food chain which ends with seals and porpoises and obviously cannot be confined to their place of discharge.
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