Washington (State). Dept. of Highways, National Research Council (U.S.). Highway Research Board. Summer meeting, & National Research Council (U.S.). Transportation Research Board. (1974). Innovations in construction and maintenance of transportation facilities: Proceedings of the sixth summer meeting of the Highway Research Board in cooperation with the Washington State Department of Highways, August 6-8, 1973, Olympia, Washington. Transportation Research Board.

Washington (State). Dept. of Highways, National Research Council (U.S.). Highway Research Board. Summer meeting, a National Research Council (U.S.). Transportation Research Board. Innovations in Construction and Maintenance of Transportation Facilities: Proceedings of the Sixth Summer Meeting of the Highway Research Board in Cooperation with the Washington State Department of Highways, August 6-8, 1973, Olympia, Washington. Washington, DC: Transportation Research Board, 1974.

Washington (State). Dept. of Highways, et al. Innovations in Construction and Maintenance of Transportation Facilities: Proceedings of the Sixth Summer Meeting of the Highway Research Board in Cooperation with the Washington State Department of Highways, August 6-8, 1973, Olympia, Washington. Transportation Research Board, 1974.