American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures, & American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures. (1975). Standard specifications for structural supports for highway signs, luminaires and traffic signals. Washington: The Subcommittee.

American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures, and American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures. Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals. Washington: The Subcommittee, 1975.

American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures, and American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures. Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals. Washington: The Subcommittee, 1975.