Union Station--National Visitor Center : hearing before the Committee on Environment and Public Works, United States Senate, Ninety-seventh Congress, first session on S. 548, a bill entitled the "Union Station Act" and S. 1192, a bill to amend the National Visitor Center Facilities Act of 1968 to provide for the rehabilitation and completion of Union Station in Washington, District of Columbia, and for other purposes, July 20, 1981