Below is a list of websites of trade associations, research institutes, and some government agencies.
AASHTO American Association of State Highways and Transportation http://www.bsigroup.co.uk/ (accessed 4 April 2010); includes separate, multi-lingual pages for Europe, Asia and the Pacific, North and South America, the Middle East and Africa
ACI American Concrete Institute http://www.concrete.org/general/home.asp
ALSC American Lumber Standard Committee http://www.alsc.org/
ANSI American National Standards Institute Standards are downloadable from their website; http://webstore.ansi.org/
ASLA American Society of Landscape Architects http://www.asla.org/
ASTM International http://www.transportation.org/
BIA Brick Industry Association ...