"Awa Ashikaga-ke Monjo" (the written materials of the Awa-Ashikaga family), which is the records of the Medieval period and modern times passed down in the Hirashima Kubo family, was investigated in former Nakagawa-cho, Tokushima Prefecture for compiling the town history.
平島公方家に伝えられた中世・近世文書群である「阿波足利家文書」は、徳島県旧那賀川町で町史編纂にあたり調査が行われた。