| Citation | Cordes, I., R.J.M. Crawford, A.J. Williams and B.M. Dyer 1999 Decrease of African penguins at the Possession Island Group, 1956-1995: contrasting trends for colonial and solitary breeders. Marine Ornithology 27:129-138. |
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| Ref. No. | 4254 |
| Language | English |
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