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Third (Triennial) Empire Mining and Metallurgical Congress. held in South Africa, March 24th to May 9th, 1930 : Proceedings, Part 4 only. Papers and Discussions, General Vaughan, J.A. [Ed.]
![Third (Triennial) Empire Mining and Metallurgical Congress. held in South Africa, March 24th to May 9th, 1930 : Proceedings, Part 4 only. Papers and Discussions, General Vaughan, J.A. [Ed.]](https://hemingwaysbooks.co.za/wp-content/uploads/2025/08/mining-scaled-1.jpg)
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