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Peer-reviewed literature from scientific journals, books and conference proceedings, covering the fields of science, technology, medicine, social sciences, and arts and humanities. Coverage: 1966 - present
Articles and citations in the sciences, social sciences, arts, and humanities. Coverage: Varies
Web of Science is comprised of several databases. The Science Citation Index Expanded (SCI) covers journals in the medical, physical and natural sciences, and engineering fields. The entire database extends back to 1899. The Social Sciences Citation Index (SSCI) covers journals in the social sciences. The entire database extends back to 1898. The Arts & Humanities Citation Index (AHCI) covers journals in the arts and humanities. It also selectively covers relevant items from science and technical journals. The entire database extends back to 1975.