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American Concrete Institute (ACI)  www.aci-int.org 
American Concrete Pavement Assosiation (ACPA)  www.pavement.com 
Amtrak  www.amtrak.com 
Association of American Railroads Transportation Technology  www.aar.com 
U.S. Army Corps of Engineers (USACE)  www.usace.army.mil 
U.S. Department of Transportation (DOT)  www.fta.dot.gov/ 
U.S. Depatment of Transportation Databases  www.nas.edu/trb/directory/db_usdot.html 
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