ASTM Directory - Containing links to scientific and technical consultants' e-mail and websites. - http://www.astm.org/cgi-bin/SoftCart.exe/CONSULTANTS/search.html?L+mystore+myqy1580
Institute of Transportation Engineers - Database of experts in traffic, road design, and accident reconstruction. - http://www.ite.org/directories/expert.asp
IEEE-USA Consultants Database - Database of consultants and experts in electrical, electronics, and computer-related fields. - http://www.ieeeusa.org/business/consultants/cgi-bin/consultant.cgi
Earth's Environmental Experts (3E). - Database of environmental experts and consultants, available to subscribers. Also offering a free trial. - http://www.3eltd.com/