 | Viljoen, P., 1992. Aerial census to gauge population trends. Custos 21 (4): 42-46, figs. 1-2
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 | Viljoen, P.J., 1982. The distribution and population status of the larger mammals in Kaokoland, South West Africa/Namibia.. Cimbebasia (A) 7 (2): 5-33, figs. 1-10
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 | Viljoen, P.J., 1982. The ecology of the desert-dwelling elephants, black rhinoceroses and giraffes of western Kaokoland and Damaraland, South-West Africa. Progress Report to Namibia Wildlife Trust No.4: 1-7
|
|
 | Viljoen, P.J., 1981. The ecology of the desert-dwelling elephants, black rhinoceroses and giraffes of western Kaokoland and Damaraland, South-West Africa. Progress Report No. 2 to Namibia Wildlife Trust, pp. 1-5
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