1. Burrows, H.L. ARS Research on strip mine reclamation. Unpub. Report. 28 pp.
2. Stripping coal resources of the United States;Averitt;U.S. Geol. Survey Bull.,1970
3. The challenge and promise of coal;Nephew;Technol. Review. Dec.,1973
4. Coal in the United States: A Status Report;Perry;Science,1983
5. Partial correlation analysis of some chemical and biological parameters of two streams receiving mine drainage;Brenner;PA Acad. Sci.,1978