Ward, Colin R, David French, Leanne Stephenson, Ken Riley, and Zhongsheng Li. 2010. “Testing of Interactions between Coal Ash Leachates and Rock Materials for Mine Backfill Evaluations.” Coal Combustion and Gasification Products 2 (1): 15–27. https://doi.org/10.4177/CCGP-D-09-00019.1.