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          Hanzhong sinkholes valuable for studies
          

          By Zhang Zhouxiang and Huo Yan | China Daily | Updated:  2017-01-27 10:18
 



          



          

          

          


          
Hanzhong sinkholes valuable for studies

          


          


          The bottom of Boniu Sinkhole in Nanzheng county often gives way to an underground river. [Photo provided to China Daily]
          
          		

          
          

          


          

          


          

          

          



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