2. The status of the north sea environment; reasons for concern vol.2 / 2nd North Sea Seminar 86. Rotterdam: 1-3 October 1986 (1987)
2. The status of the north sea environment; reasons for concern vol.2 / 2nd North Sea Seminar 86. Rotterdam: 1-3 October 1986.
Amsterdam : Werkgroep noordzee, 1987.
351 p
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