American Road and Transportation Builders Association - http://www.artba.org
Association of Asphalt Pavement Technologists http://www.asphalttechnology.org
Association of Modified Asphalt Producers http://www.modifiedasphalt.org
Asphalt Roofing Manufacturers Association http://www.asphaltroofing.org
International Society for Asphalt Pavements (ISAP) http://www.asphalt.org
Louisiana Transportation Research Center (LTRC) - http://www.ltrc.lsu.edu/
National Association of County Engineers - http://www.countyengineers.org/
North Central Regional Superpave Center - http://ce.ecn.purdue.edu/~spave/
United States Federal Agencies and Resources
Federal Highway Administration (FHWA) - http://www.fhwa.dot.gov/
FHWA Programs - http://www.fhwa.dot.gov/programs.html
FHWA Office of Pavement Technology - http://www.ota.fhwa.dot.gov/
FHWA Research and Technology- http://www.fhwa.dot.gov/rnt4u/index.htm
National Highway Specifications - http://www.specs.fhwa.dot.gov
Transportation Research Board (TRB) Bookstore http://nationalacademies.org/trb/bookstore/