. . . . . . . . . "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 ... and S. 1192 ... July 20, 1981"@en . "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 ... and S. 1192 ... July 20, 1981"@en . . . . . .