Seiichi Okada1947BooksKawagoe-shi no kenkyūChūsei Tōgoku no chiiki shakai to rekishi shiryōSōma-shi no seiritsu to hattenHōjō tokusō-ke no kōbōHōjō YoshitokiKamakura Bakufu to TōgokuChūsei Sōma-shi no kisoteki kenkyūChūsei Minami Ōu no chiiki shosōSōma-han seikiAuthor data: Open Library