Alex Frith
Unknown Author
Tom Iseley
American Public Works Association.
Joint Committee on Location of Underground Services.
Ward, Brian
Eugene Booth
Lawrence M. Slavin
Oakland (Calif.)
International Conference on Trenchless Technology (3rd 1988 Washington, D.C.)
Conference on Engineering Utility Tunnels in Urban Areas New England College 1971.
William Henry Brown
G. J. Edgell
Henry
American Society of Civil Engineers. Earthquake Investigations Committee.
International Society for Trenchless Technology.
Doboku Gakkai. Kensetsuyō Robotto Iinkai. Raifurain Gijutsu Shōiinkai