Social and economic history of Qinghai-Tibet Plateau 并列题名：Social and economic history of Qinghai-Tibet Plateau Social and economic history of Roman empire Social and economic history of Roman Empire Social and economic history of the Roman empire The social and economic history of the Hellenistic world Social and economic history of the Chinese overseas in Africa The secial and enconomic history of Roman Empire Development and enviroment of Qinghai tibet plateau 并列题名：Social and economic history of the Roman empire