In Bulletin No 76, which gave average data for 1971, it was mentioned that Enyati and Vaalbank collieries ceased production during that year.
Reference:
Savage, W. 1972. Analysis of product samples taken by the Fuel Research Institute during 1972. http://hdl.handle.net/10204/12938 .
Savage, W. (1972). Analysis of product samples taken by the Fuel Research Institute during 1972 Retrieved from http://hdl.handle.net/10204/12938
Savage, WHD Analysis of product samples taken by the Fuel Research Institute during 1972. 1972. http://hdl.handle.net/10204/12938
Savage W. Analysis of product samples taken by the Fuel Research Institute during 1972. 1972 [cited yyyy month dd]. Available from: http://hdl.handle.net/10204/12938
