| Walker, C.H., 1992. Chairman's report to the Rhino & Elephant Foundation annual general meeting for March 1990 to April 1991. REF Journal 6: 30-32, figs. 1-3
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| Walker, C.H., 1990. Moving to save the black rhino. Custos 18 (12): 24-26, figs. 1-3 (Afrikaans, pp. 28-29)
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| Walker, C.H., 1989. The role of non-governmental organisations in black rhinoceros Diceros bicornis conservation in Africa (abstract). Koedoe 32 (2): 87-88, table 1
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