Oldest salt well harnesses 2,000-year-old method in SW China
By Yao Yao | chinadaily.com.cn | 2017-04-26 11:00
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The Shenhai salt well is seen in Da'an district, Zigong city, Southwest China's Sichuan province, on April 25, 2017. [Photo by TG/ provided to chinadaily.com.cn]
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