Groundwater-related programs of the USGS and the EPA :
hearings before the Subcommittee on Water and Power of the Committee on Energy and Natural Resources, United States Senate, One Hundredth Congress, first session ... June 5 and 18, 1987.

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Item Link Original Source
Full view   University of Michigan
Full view   4.En 2:S.hrg.100-330 Pennsylvania State University