PubMed This link opens in a new windowPubMed, a service of the National Library of Medicine, provides access to over 12 million MEDLINE citations. Encompasses information from Index Medicus, Index to Dental Literature, and International Nursing, as well as other sources of coverage in the areas of allied health, biological and physical sciences, humanities and information science as they relate to medicine and health care, communication disorders, population biology, and reproductive biology.