Ziemkiewicz P.. Long-Term Performance of Passive AMD Treatment Systems in the Eastern U.S.. Presented at the 2002 workshop.
Hedin R.S.. Successful Passive Treatment of Coal Mine Drainage, a 2010 Update. Presented at the 2010 workshop.
- Passive Treatment of Coal Mine Drainage (Bureau of Mines Information Circular 9389, 1994)
- Iron Removal by a Passive System Treating Alkaline Coal (Mine Drainage, Mine Water Environment, 2008, volume 27, pages 200-209)