| http://www.w3.org/ns/prov#value | - PVC and other modern materials didn't exist when this infrastructure was originally installed, and it is all starting to break down. permalinkparent[???][deleted] 1 point2 points3 points 1 year ago (0 children)sorry, this has been archived and can no longer be voted onKentucky and other areas that sit on shallow karst have natural sinkholes.
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