1. In-line aeration and treatment of acid mine drainage;Ackman;U.S. Dep. Interior, Bureau Mines, Rep. Invest.,1988
2. Sulfate adsorption onto iron and aluminium hydroxides;Bradley;Eos,1989
3. Soil survey of Centre County, Pennsylvania;Braker,1981
4. Hydrogeological controls on sulfate concentrations in groundwater: Appalachian Mountains;Brooks,1993
5. Minimizing water treatment costs at active operations;Benedetti,1990