Books by Seiichi Okada
Chūsei Minami Ōu no chiiki sho
Chūsei Minami Ōu no chiiki shosō
Sōma-shi no seiritsu to hatten
Sōma-shi no seiritsu to hatten
Chūsei Tōgoku no chiiki shakai
Chūsei Tōgoku no chiiki shakai to rekishi shiryō
Kamakura Bakufu to Tōgoku
Kamakura Bakufu to Tōgoku
Kawagoe-shi no kenkyū
Kawagoe-shi no kenkyū
Hōjō tokusō-ke no kōbō
Hōjō tokusō-ke no kōbō
Chūsei Sōma-shi no kisoteki ke
Chūsei Sōma-shi no kisoteki kenkyū
Sōma-han seiki