| Citation | Crawford, R.J.M., A.J. Williams, R.M. Randall, B.M. Randall, A. Berruti and G.J.B. Ross 1990 Recent population trends of Jackass Penguins Spheniscus demersus off Southern Africa. Seabirds Biological Conservation 52:229-243. |
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| Ref. No. | 3952 |
| Language | English |
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