The Grey Seal and Common Seal in European waters
Bonner, W.N. (1972). The Grey Seal and Common Seal in European waters, in: Barnes, H.B. (Ed.) Oceanogr. Mar. Biol. Ann. Rev. 10. Oceanography and Marine Biology: An Annual Review, 10: pp. 461-507
In: Barnes, H.B. (Ed.) (1972). Oceanogr. Mar. Biol. Ann. Rev. 10. Oceanography and Marine Biology: An Annual Review, 10. George Allen & Unwin: London. ISBN 0-04-551019-9. 565 pp., meer
In: Oceanography and Marine Biology: An Annual Review. Aberdeen University Press/Allen & Unwin: London. ISSN 0078-3218; e-ISSN 2154-9125, meer
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