- Representing a collection of historical materials dating from the era of the Six National Histories, it was (and is) in the process of compilation for many years by the Office of Historiography in the Faculty of Letters at Tokyo Imperial University (today's Historiographical Institute at the University of Tokyo).
-東京帝国大学文科大学史料編纂掛（東京大学史料編纂所）により編纂が続けられており、六国史以降の史料をまとめている。