Einstein, H.H. (1978). Observational tunnel design-construction methods in the U.S. In: Proceedings of Shotcrete for Underground Support III, Engineering Support Conference, At. Anton am Arlberg, Austria, April 16-21, 1978.
Einstein, H.H. (1978). Observational tunnel design-construction methods in the U.S. In: Proceedings of Shotcrete for Underground Support III, Engineering Support Conference, At. Anton am Arlberg, Austria, April 16-21, 1978.