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3. Crews inspect condition of golden gate bridge's towers April 30 2018.https://www.nbcbayarea.com/on‐air/as‐seen‐on/crews‐inspect‐condition‐of‐golden‐gate‐bridge_s‐towers_bay‐area‐2/61247/.
4. U.S Department of transportation highway administration national bridge inventory data 2019.http://www.fhwa.dot.gov/bridge/nbi.cfm.
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