1. Spoil Heaps and Lagoons, Technical Handbook;Anonymous,1973
2. South African Water Quality Guidelines, Domestic Use;Anonymous,1993
3. Understanding the problems of spontaneous combustion;Beever;Fire Eng.,1982
4. The history and techniques of coal mining and the associated effects and influence on construction;Bell;Bull. Assoc. Eng. Geol.,1988
5. Dereliction: colliery spoil heaps and their restoration;Bell;Environ. Eng. Geosci.,1996