- Database indexes approximately 1,300,000 articles in nearly 1,100 periodicals as well as citations of over 240,000 book reviews.
- Covers period from 1907-1984 and includes earlier data bases which are the International Index 1907-1965; Social Sciences & Humanities Index 1965-1974; Humanities Index 1974-1984; Social Science Index 1974-1984.
- Covers the most important scholarly journals published throughout the early to mid twentieth century in North America, including some important scientific journals through the 1950s.
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