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363.738409682 (1) |
Acid mine drainage (1) |
Acid mine drainage -- South Africa -- Vaal River (1) |
Mines and mineral resources -- Environmental aspects -- South Africa -- Vaal River (1) |
Mining (1) |
Socio-economic impacts (1) |
South Africa (1) |
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Vaal River (South Arica) (1) |
Water management (1) |
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