Representing national bibliographies,「Periodical Index」consists of selected articles necessary for legislative activities among domestic periodicals. The database holds 2.97 million articles as of 2008, and of these 730,000 articles are stored in full texts and available on the Digital Library.

This is a collection of domestic master and doctorate theses, and the database holds 1.14 million theses as of January 2008. Of these, 560,000 theses are stored in full texts and available on the Digital Library.