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CAMPHUYSEN C. J., ENSOR K., FURNESS R. W., GARTHE S., Huppop 0., LEAPER G., OFFRINGA H. & TASKER M. L. 1993. Seabirds feeding on discards in winter in the North Sea. NIOZ-rapport 1993-8. Nederlands Instituut voor Onderzoek der Zee, Texel. 140 p.

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