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Crawford RJM, Altwegg R, Barham BJ, Barham PJ, Durant JM, Dyer BM 2011. Collapse of South Africa's penguins in the early 21st century. African Journal of Marine Science 33 (1) 139-156
Crawford RJM, Williams AJ, Hofmeyr JH, Klages NTW, Randall RM, Cooper J, Dyer BM, Chesselet Y 1995. Trends of African Penguin Spheniscus demersus populations in the 20th-century. South African Journal of Marine Science 16 (1) 101-118
Crawford RJM, Dyer BM, Brown PC 1995. Absence of breeding by African Penguins at 4 former colonies. South African Journal of Marine Science 15 269-272

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