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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
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
Shannon LV, Crawford RJM, Duffy DC 1984. Pelagic fisheries and warm events - a comparative study. South Africa Journal of Science 80 51-60

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