PMC is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM).

Search more than 24 million citations for biomedical literature from MEDLINE, life science journals and online books. Full Websites also available.

Mobile site features multiple ways to search PubMed/MEDLINE: PICO (Patient, Intervention, Comparison, Outcome); askMEDLINE, a free-text, natural language search; and Consensus Abstracts. Apple iOS app includes these options as well as BabelMeSH which has search options in 13 languages.

The Merck Veterinary Manual is a comprehensive, reliable reference for veterinary professionals.

online diagnostic support system for veterinary medicine from the Cornell University College of Veterinary Medicine