Keywords: Concrete surface deterioration.JPG en Deteriorated concrete on the underside of a stairway in the en New York City Subway 2014-12-31 03 49 09 own B137 other versions cc-zero Uploaded with UploadWizard New York City Subway stairs Taken with AF-S DX Nikkor 18-55mm f/3 5-5 6G VR Taken with Nikon D5100 |