Eshraghi, Shaun, author.
Washington, DC : U.S. Department of Transportation, Federal Railroad Administration, Office of Research, Development and Technology, February 2021.
2021-
Schwartz, Kelly, author.
Washington, DC : U.S. Department of Transportation, Federal Railroad Administration, Office of Research, Development, and Technology, March 2021.
2021-
United States. Congress. Senate. Committee on Homeland Security and Governmental Affairs, author.
Washington : U.S. Government Publishing Office, 2015.
2015