Title: Tsūkō, tsūshōken no kakudai
Subjects: Foreign relations, Politics and government, Commerce, History, Nihon-Taigai kankei-Rekishi, Nihon-Rekishi-Heian jidai, Nihon-Bōeki-Ajia(Tōbu)-Rekishi
Places: Japan, East Asia
Time periods: To 1600, 794-1185, To 1500