The status of marine mammals in the Wadden Sea area
Wolff, W.J. (1981). The status of marine mammals in the Wadden Sea area, in: Reijnders, P. et al. (Ed.) Marine mammals of the Wadden Sea: final report of the section 'Marine Mammals' of the Wadden Sea Working Group. Reports of the Wadden Sea Working Group, 7: pp. 7-14
In: Reijnders, P.; Wolff, W.J. (Ed.) (1981). Marine mammals of the Wadden Sea: Final report of the section 'Marine Mammals' of the Wadden Sea Working Group. Reports of the Wadden Sea Working Group, 7. Stichting Veth tot Steun aan Waddenonderzoek: Leiden. ISBN 90-6191-057-9. 64 pp., more
In: Reports of the Wadden Sea Working Group, more
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