1 South Dakota's Underground Lakes May Hold Purest Water On Earth Posted by Cheryl Nelson on August 29, 2015 at 2:46pm in 3D News http://www.huffingtonpost.com/entry/wind-cave-national-park-purest-water_55e1c8f0e4b0b7a963393563?ncid=txtlnkusaolp00000592 You need to be a member of Earthchangers College to add comments! Join Earthchangers College Email me when people reply – Follow
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