Harpers Ferry National Monument, indoor facilities, and the Pennsylvania Avenue Development Corporation : hearing before the Subcommittee on Parks and Recreation of the Committee on Interior and Insular Affairs, United States Senate, Ninety-third Congress, second session on S. 605, a bill to amend the Act of June 30, 1944, an act "To provide for the establishment of the Harpers Ferry National Monument", and for other purposes : S. 2661, a bill to amend the Land and Water Conservation Fund Act of 1965 so as to authorize the development of indoor recreation facilities in certain areas : S. 3301, a bill to amend the Act of October 27, 1972 (Public Law 92-578), May 9, 1974