The Merck Index contains information on chemicals, drugs and biologicals. It contains monographs – including historic records not available in the print edition. The Merck Index Online will be updated regularly with accurate information curated by experts.
PubMed, a service of the National Library of Medicine, provides access to MEDLINE citations back to the mid-1960's and additional life science journals. It also includes links to many sites providing full text articles and other related resources. This is a freely accessible site. Contents may change without warning.
Web of Science (formerly Web of Knowledge) offers a wide range of interdisciplinary content. Also included: prominent journals and conference proceedings, Arts & Humanities Citation Index (1985-present); Science Citation Index (1955-present); and Social Sciences Citation Index (1900-present).