戦国期東国の在地社会に見る土豪層と国衆の関係―天文二十一年四月二十七日葛山氏元判物考― The Relationship between Dogō (Powerful Local Clans) and Kunishū (Local Lords) in the Eastern Villages of Japan During the Sengoku Period: A Study of Documents with Katsurayama Ujimoto’s Original Seal dated April 27, 1552 2023年11月 発行