The National Institute of Japanese Literature (Kokubunken) has made their new新日本古典籍総合データベース/Database of Pre-Modern Japanese Works (tentative edition) freely available at: https://kotenseki.nijl.ac.jp/ (Japanese interface) and https://kotenseki.nijl.ac.jp/?ln=en (English interface).
The database, built out of Kokusho Sōmokuroku, a Japanese reference book published by Iwanami Shoten, and the largest of its kind, contains about 300,000 of 500,000 entries listed in the original book, along with digitized versions of materials referred to by the entries. It also allows one action search across repositories of multiple institutions.
For more information, please see the “Project to Build an International Collaborative Research Network for Pre-modern Japanese Texts (NIJL-NW project)” websites at:
