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Nearly 4 million bibliographic records. Indexing of more than 2,500 journals, 99% of which are peer-reviewed. Coverage dating back to the 17th and 18th centuries, with extensive coverage from the 1800s to the present. Authored and edited books and book chapters. Dissertations selected from Dissertation Abstracts International (Sections A and B). Publications from more than 50 countries. Updated weekly. Methodology Definitions