National Ground Water Contamination Research Act : hearing before the Subcommittee on Water and Power Resources of the Committee on Interior and Insular Affairs, House of Representatives, One Hundredth Congress, first session on H.R. 791 to authorize the water research activities of the United States Geological Survey, and or other purposes, : hearing held in Washington, DC, February 26, 1987. (U.S. G.P.O., 1987)