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Coal reserves of the Republic of South Africa : an evaluation at the end of 1982
- "Steenkoolreserwes van die Republiek van Suid-Afrika"@en
- "Steenkoolreserwes van die Republiek van Suid-Afrika"
- "Coal reserves of the Republic of South Africa : an evaluation at the end of 1982"@en
- "Coal reserves of the Republic of South Africa : an evaluation at the end of 1982"