General Medical Reference
- Hardin Meta Directory of Internet Health Sources (University of Iowa)
- Virtual Hospital (University of Iowa)
- Merck Medicus (free for physicians)
- Merck Source
- Merck Manuals Online
- A.D.A.M. Multimedia Illustrated Health Encyclopedia (Merck)
- Health Tracking Resources (Merck)
- Clinicaltrials.gov (NIH)
- NIOSH - Pocket Guide to Hazardous Chemicals (CDC)
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