National Wildlife Refuge System Management and Policy Act : hearing before the Subcommittee on Clean Water, Fisheries, and Wildlife of the Committee on Environment and Public Works, United States Senate, One Hundred Third Congress, first session, on S. 823, a bill to amend the National Wildlife Refuge System Administration Act of 1966 to improve the management of the National Wildlife Refuge System, and for other purposes, June 9, 1993.