1. Standard Methods for the Examination of Water and Wastewater;American Water Works Association, Water Environment Federation,2005
2. Coal Mine Waters in South Africa: Their Geochemistry Quality and Classification;Azzie,2002
3. Dereliction: colliery heaps and there rehabilitation;Bell;Environ. Eng. Geosci.,1996
4. Acid-neutralization reactions in inactive mine tailings impoundments and their effect on the transport of dissolved metals;Blowes,1994
5. Basic Statistics: a Real World Approach;Congelosi,1983