WATER is a problem in China's arid Northwest. An unfailing supply is indispensable for the development of industry and agriculture there. In the districts of Yumen, Ansi and Tunhuang in Kansu...
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WATER is a problem in China's arid Northwest. An unfailing supply is indispensable for the development of industry and agriculture there. In the districts of Yumen, Ansi and Tunhuang in Kansu...