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2. Águas subterrâneas

10. Bulletin

13. Clean Water Act research and monitoring : hearing before the Subcommittee on Environment of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred Second Congress, first session, June 5, 1991

45. Ground water

46. Ground water

54. Ground-water conditions in Georgia

75. Journal of contaminant hydrology

77. Management of the San Gabriel Valley superfund sites I-IV : hearing before the Subcommittee on Environment and Labor of the Committee on Small Business, House of Representatives, One Hundred First Congress, second session, Baldwin Park, CA, October 30, 1990

82. Pesticides in groundwater : hearing before the Subcommittee on Oversight and Investigations of the Committee on Energy and Commerce, House of Representatives, One Hundred Second Congress, first session, May 8, 1991

94. Reclamation Wastewater and Groundwater Study Act, and Reclamation Projects Authorization and Adjustment Act of 1990 : hearing before the Subcommittee on Water and Power of the Committee on Energy and Natural Resources, United States Senate, One Hundred First Congress, second session on S. 2657, to direct the Secretary of the Interior, acting pursuant to the Reclamation Act of 1902 (Act of June 17, 1902, 32 Stat. 388) and acts amendatory thereof and supplementary thereto, to undertake certain studies to investigate opportunities for wastewater reclamation and reuse, to conduct studies of groundwater, and for other purposes : H.R. 2567, an act entitled: Reclamation Projects Authorization and Adjustment Act of 1990, September 27, 1990

100. Review of the U.S. Department of Agriculture's fiscal year 1990 water quality initiative : hearings before the Subcommittee on Department Operations, Research, and Foreign Agriculture of the Committee on Agriculture, House of Representatives, One Hundred First Congress, first session, June 21, 1989, Washington, DC, and June 30, 1989, Stephenville, TX.