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American Association of State Highway and Transportation Officials (AASHTO) | 1995 | 1978 |
American Railway Engineering Assoc. | 1978,84 | |
American Road and Transportation Builders Association | 1978,84,91 | |
American Society of Civil Engineers | 1978 | |
Associated General Contractors of America | 1984 | |
California Depart. of Transportation | 1995 | |
Colorado Department of Highways | 1991 | |
Federal Highway Administration | 1978,84,91,95 | |
Federal Railroad Administration | 1978,95 | |
International Assoc. for Bridge and Structural Engineering | 1978 | |
International Road Federation | 1984,91 | |
Minnesota Chapter, American Public Works Association |
1984 | |
Minnesota Depart. of Transportation | 1984 | |
Missouri Pacific Railroad Company | 1978 | |
Missouri State Highway Commission | 1978 | |
National Assoc. of County Engineers | 1978,84 |