Mining - SA Auction #44 Results
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Louis T. Nel
Union of South Africa. Department of Mines and Industries. The geology of the country around Vredefort (1927; 1st Edition)
An explanation of the geological survey map (Union of South Africa Department of Mines and Industries. Geological survey).
Cape of Good Hope: Department of Agriculture
Twelfth to Sixteenth Annual Report of the GEOLOGICAL COMMISSION 1907 - 1911