Review of ground water quality concerns : hearings before the Subcommittee on Department Operations, Research, and Foreign Agriculture of the Committee on Agriculture, House of Representatives, One Hundredth Congress, first and second sessions, October 12, 1987, Humboldt, IA; October 27 and December 9, 1987; March 29 and May 24, 1988.
- Groundwater United States Quality
Groundwater Pollution United States
Water quality management United States
Agricultural chemicals Environmental aspects United States
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