Kychanov E. Irrigation in the Tangut State of Xi Xia (982—1227) // Talking about Dunhuang on the Riverside of the Neva / 涅瓦河邊談敦煌. Ed. by TAKATA Tokio / 高田時雄編. Institute ror Research in Humanities Kyoto University / 京都大學人文科學研究所 2012. P. 1—19.
In spite of the fact that the Xi Xia territory of the Tangut state consisted mostly of mountains, desert, and semi-desert regions, a significant part of the country was suitable for agriculture. Soil along the Huang He River from Yinchuan to Lanzhou was cultivated from ancient times and yielded a good harvest; Nanshan and Xining were also fertile territories...
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