PubMed, developed by the National Library of Medicine (NLM), provides free access to MEDLINE, a database of more than 11 million bibliographic citations and abstracts from nearly 4,500 journals in the fields of medicine, nursing, dentistry, veterinary medicine, pharmacy, allied health, health care systems, and pre-clinical sciences. PubMed also contains links to the full-text versions of articles at participating publishers' Web sites. In addition, PubMed provides access and links to the integrated molecular biology databases maintained by the National Center for Biotechnology Information (NCBI). These databases contain DNA and protein sequences, 3-D protein structure data, population study data sets, and assemblies of complete genomes in an integrated system. Additional NLM bibliographic databases, such as AIDSLINE, are being added to PubMed. PubMed includes "Old Medline." Old Medline covers 1950-1965. (Updated daily)
Information on "Old Medline": http://www.nlm.nih.gov/databases/databases_oldmedline.html"