Washington State Highway Commission.
Unknown Author
Canada. Restrictive Trade Practices Commission
California. Dept. of Public Works.
Voravit Lertlaksana
American Railway Engineering Association
E. George Robison
Ohio. Department of Highways
Canada. Restrictive Trade Practices Commission.
Lester A. Herr
Gerald A. Willett
David Leroy Yarnell
William Oscar Ree
American Association of State Highway Officials
Richard B. Osborne
Calif.) Technology & Development Center (San Dimas
Armco Culvert Manufacturers Association
Raymond J. Krizek
Jacques Boubee