The No. 4 seam at this colliery, judging from the diagrammatic representations at the end of the report, appears to maintain a uniform structure and a fairly consistent thickness throughout the mine.
Reference:
Berry, H. 1949. The physical and chemical survey of the No.4 seam at Alpha Colliery, district Witbank, Transvaal survey. http://hdl.handle.net/10204/12831 .
Berry, H. (1949). The physical and chemical survey of the No.4 seam at Alpha Colliery, district Witbank, Transvaal survey Retrieved from http://hdl.handle.net/10204/12831
Berry, H The physical and chemical survey of the No.4 seam at Alpha Colliery, district Witbank, Transvaal survey. 1949. http://hdl.handle.net/10204/12831
Berry H. The physical and chemical survey of the No.4 seam at Alpha Colliery, district Witbank, Transvaal survey. 1949 [cited yyyy month dd]. Available from: http://hdl.handle.net/10204/12831
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