U.S. GEOLOGICAL SURVEY TOXIC SUBSTANCES HYDROLOGY PROGRAM--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999

U.S. Geological Survey Water-Resources Investigations Report 99-4018A, Volume 1, Contamination from Hard-Rock Mining

U.S. Geological Survey Water-Resources Investigations Report 99-4018B, Volume 2, Contamination of Hydrologic Systems and Related Ecosystems

U.S. Geological Survey Water-Resources Investigations Report 99-4018C, Volume 3, Subsurface Contamination From Point Sources