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American Association of State Highway
and Transportation Officials (AASHTO)
<http://www.aashto.org>
American Backflow Prevention Association
<http://www.abpa.org>
American Railway Engineering and Maintenance-of-Way
Association
<http://www.arema.org>
American Society of Civil Engineers
<http://www.asce.org>
American Society of Highway Engineers
<http://www.highwayengineers.org>
American Society of Mechanical Engineers
<http://www.asme.org>
American Water Resources Association
<http://www.awra.org>
Association of Asphalt Paving Technologists
<http://www.asphalttechnology.org>
Association of Energy Engineers
<http://www.aeecenter.org>
Association of State and Interstate
Water Pollution Control Administrators
<http://www.asiwpca.org>
The Canadian Technical Asphalt Association
<http://www.ctaa.ca>
Institute of Transportation Engineers
<http://www.ite.org>
International Right of Way Association
<http://www.irwaonline.org>
National Society of Professional Engineers
<http://www.nspe.org>
Natural Gas and Electric Power Society
<http://www.ngeps.org>
Water Utility Benchmarking Association
<http://www.waterbenchmarking.com> | 
