- Intermodal Transportation – A Variety of Factors Influence Airport-Intercity Passenger Rail Connectivity, GAO-13-691, Aug 2, 2013
- Intermodal Transportation – Results of GAO’s Survey on Air-Rail Connectivity (GAO-13-692SP, August 2013), an E-supplement to GAO-13-691, GAO-13-692SP, Aug 2, 2013
- Transportation Security, Action Needed to Strengthen TSA’s Security Threat Assessment Process, GAO-13-629, Jul 19, 2013
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