Web of Science This link opens in a new windowThe Web of Science indexes cover over 20,000 journals. Science Citation Index Expanded covers content in the life sciences, natural sciences, biomedical sciences, engineering, computer science and materials science. The other citation indexes are Social Science, Arts & Humanities, Emerging Sources, and Korean and Latin American journals. Other features include the ProQuest dissertations index, a preprints database, and a database of previously awarded grants.