- American Institute of Chemical Engineers - Searchable database of chemical engineering consultants and experts.
- ASTM Directory - Containing links to scientific and technical consultants' e-mail and websites.
- Earth's Environmental Experts (3E). - Database of environmental experts and consultants, available to subscribers. Also offering a free trial.
- IEEE-USA Consultants Database - Database of consultants and experts in electrical, electronics, and computer-related fields.
- Institute of Transportation Engineers - Database of experts in traffic, road design, and accident reconstruction.
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