American Association of State Highway and Transportation Officials (AASHTO) - http://www.aashto.org
American National Standards Institute (ANSI) - http://www.ansi.org
American Segmental Bridge Institute (ASBI) - http://www.asbi-assoc.org
American Society for Testing and Materials (ASTM) - http://www.astm.org
American Welding Society (AWS) - http://www.aws.org
Design-Build Institute of America - http://www.dbia.org
Post-Tensioning Institute - http://www.post-tensioning.org