National heritage areas : hearing before the Subcommittee on National Parks of the Committee on Energy and Natural Resources, United States Senate, One Hundred Eighth Congress, first session, to conduct oversight on the designation and management of national heritage areas, including criteria and procedures for designating heritage areas, the potential impact on heritage areas on private lands and communities, federal and non-federal costs of managing heritage areas, and methods of monitoring and measuring the success of heritage areas, March 13, 2003.