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3. Barriers to the cleanup of abandoned mine sites : hearing before the Subcommittee on Water Resources and Environment of the Committee on Transportation and Infrastructure, House of Representatives, One Hundred Ninth Congress, second session, March 30, 2006

4. Barriers to the cleanup of abandoned mine sites : hearing before the Subcommittee on Water Resources and Environment of the Committee on Transportation and Infrastructure, House of Representatives, One Hundred Ninth Congress, second session, March 30, 2006