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Web of Science Core Collection is a curated collection of over 20,000 peer-reviewed, high-quality scholarly journals published worldwide (including Open Access journals) in over 250 science, social sciences, and humanities disciplines. Conference proceedings and book data are also available. It contains 69 million records, 1 billion cited references, and covers articles published 1900-present.
If you're new to citation indexes, this video highlights the benefits of using a citation index: