1. EPA’s National Hardrock Mining Framework; U.S. Environmental Protection Agency; Office of Solid Waste and Emergency Response; Office of Enforcement and Compliance Assurance; Office of Water: Washington, DC, 1997.
2. Hardrock Mining on Federal Lands; National Research Council; National Academy Press: Washington, DC, 1999.
3. McKnight, E.T.; Fischer, R.P.Geology and Ore Deposits of the Picher Field, Oklahoma and Kansas; U.S. Government Printing Office: Washington, DC, 1970.
4. Luza, K.V.Stability Problems Associated with Abandoned Underground Mines in the Picher Field Northeastern Oklahoma; Oklahoma Geological Survey: Norman, OK, 1986.
5. Datin, D.L.; Cates, D.A.Sampling and Metal Analysis of Chat Piles in the Tar Creek Superfund Site; Prepared by the Tar Creek Superfund Site, Ottawa County, OK, for the Oklahoma Department of Environmental Quality: Oklahoma City, OK, 2002.