One hundred and thirty of the more than 400 subterranean rivers in the karst (limestone) areas of the Guangxi Zhuang Autonomous Region, south China, are being exploited, some being made to generate...
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One hundred and thirty of the more than 400 subterranean rivers in the karst (limestone) areas of the Guangxi Zhuang Autonomous Region, south China, are being exploited, some being made to generate...