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Encounter near East Driefontein Mines, South Africa, in 1953
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Encounter near Harare, Zimbabwe, on 20 October 1996
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Encounter near Hassi Bouniffe, Algeria, on 20 July 2000
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Encounter near Johannesburg in June 1988
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Encounter near Lagos, Nigeria, on 1 October 1974
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Encounter near Paarl Cape Town, South Africa, in spring 1951
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Encounter on 17 August 1975 near Shabani Zimbabwe
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Presentation on the Ruwa case
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