Sudbury, Assabet, and Concord Rivers; Coastal Heritage Trail in New Jersey; Delaware and Lehigh Canal; El Camino Real de Tierra Adentro; and Trail Center in Casper, Wyoming : hearing before the Subcommittee on National Parks, Historic Preservation, and Recreation of the Committee on Energy and Natural Resources, United States Senate, One Hundred Fifth Congress, second session, on S. 469, S. 1016, S. 1665, S. 2039, H.R. 2186, June 18, 1998. (U.S. G.P.O. :, 1998)