American Association of State Highway and Transportation Officials AASHTO 2
American Association of State Highway and Transportation Officials AASHTO 2 : A regulatory organization which governs the design and specifications of highway bridges
Complete Design, Inc. (Construction Design Specialists), Dictionary of Construction Terminology, Washington, USA 2015. http://completedesign.cc/client-resources/dictiona ry-of-construction-terminology, (Const - Amer) {836}