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2. Avery G (1981) Results of beach patrols conducted in southern Africa in 1980. Cormorant 9:113–122
3. Avery G (1982) Results of beach patrols conducted in southern Africa in 1981. Cormorant 10:87–96
4. Avery G (1984) Results of beach patrols conducted in southern Africa in 1982. Cormorant 12:29–43
5. Avery G (1989) Results of patrols for beached seabirds conducted in southern Africa in 1984 and 1985. Cormorant 17:57–71