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19. Implementation of the underground storage tank program : hearing before the Subcommittee on Environmental Protection of the Committee on Environment and Public Works, United States Senate, One Hundred First Congress, second session on S. 1560 ... February 20, 1990

20. Implementation of the underground storage tank program : hearing before the Subcommittee on Environmental Protection of the Committee on Environment and Public Works, United States Senate, One Hundred First Congress, second session on S. 1560, a bill to suspend the enforcement of certain regulations relating to underground storage tanks, and for other purposes, February 20, 1990

24. In our own backyard

40. Information series

50. In-situ bioremediation of contaminated ground water

57. International groundwater law