This database is a citation index to periodical articles published in Japanese since 1868. Based on Meiji-Taisho-Showa-zenki Zasshi Kiji Sakuin Shusei, the database complements NDL's online index to magazines and periodicals (Kokuritsu Kokkai Toshokan Zasshi Kiji Sakuin). In addition, the coverage includes nationally distributed periodicals (Zenkoku-shi) and regionally published periodicals (Chiho-shi) as well as those published in former Japanese colonies (such as Toa Dobunkai and Toa Dobunshoin Daigaku). (Updates unknown)