Federal Highway Administration. "National Bridge Inventory: Route 664". Alexander Svirsky. Archived from the original on December 12, 2015. Retrieved February 17, 2010. To retrieve the data, enter Pennsylvania for the state and 664 for the route, and click the submit-query button.
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Federal Highway Administration. "National Bridge Inventory: Route 664". Alexander Svirsky. Archived from the original on December 12, 2015. Retrieved February 17, 2010. To retrieve the data, enter Pennsylvania for the state and 664 for the route, and click the submit-query button.