MedlinePlus The National Library of Medicine created and maintains this resource to assist in locating authoritative health information. It contains carefully selected links to websites with health information on 900+ topics. The health topic pages include links to current news and related information. The A.D.A.M. medical encyclopedia brings health consumers an extensive library of medical images and videos, as well as 4,000+ articles about diseases, tests, symptoms, injuries, and surgeries.