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U.S. Army Corps of Engineers (USACE) http://www.usace.army.mil/
Federal Aviation Administration http://www.faa.gov/
American Concrete Institute (ACI) http://www.aci-int.org/
American Concrete Pavement Association (ACPA) http://www.pavement.com/
Association of American Railroads Transportation Technology Center (TTCI) http://www.aar.com
Institute of Transportation Engineers (ITE) http://www.ite.org/
American Association of State Highway and Transportation Officials http://www.aashto.org/
Amtrak http://www.amtrak.com/
National Asphalt Pavement Association http://www.hotmix.org/
Airfields, Pavements and Mobility Information Analysis Center(APMIAC) http://www.dtic.mil:80/iac/iac_dir/APMIAC.html
Concrete Technology Information Analysis Center (CTIAC) http://www.dtic.mil:80/iac/iac_dir/CTIAC.html
Soil Mechanics Information and Analysis Center (SMIAC) http://www.dtic.mil:80/iac/iac_dir/SMIAC.html
U.S. Department of Transportation Databases http://www.nas.edu/trb/directory/db_usdot.html
Transportation Research Board (TRB) http://www.nas.edu/trb
ITS America http://www.itsa.org/