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September 14, 2015 Concrete curing marks with runs from water drips on a column at the Gateway T stop in Downtown Pittsburgh.
September 14, 2015 Concrete curing marks with runs from water drips on a column at the Gateway T stop in Downtown Pittsburgh.
  • pattern
  • drip
  • dots
  • residue
  • concrete
  • moisture
  • marks
  • water
  • drops
  • line
  • irregular