1. Caruccio, F. T., 1968, An evaluation of factors affecting acid mine drainage production and the ground water interactions in selected areas of western Pennsylvania: Second symposium of coal mine drainage research, Bituminous coal Research, Inc., Monroeville, PA.
2. Essington, M. E., S. V. Mattigod, and J. O. Ervin, 1985, Particle sedimentation rates in the linear density gradient: Soil Sci. Soc. Am. J., v. 49, p. 767–771.
3. Final technical report USEPA grant;L. J. Lund,1980
4. EPA 600/2-78-054;A. A. Sobek,1978
5. Sposito, G., L.J. Lund, and A. C. Chang, 1982, Trace metal chemistry in arid-zone field soils amended with sewage sludge: fractionation of Ni, Cu, Zn, Cd, and Pb in solid phases: J. Water Pollut. Control Fed., v. 46, p. 260–264.