Clasificación de la Biblioteca del CongresoTF725.K4
Obras Selectas (826 en total)
- The Subterranean Railway: How the London Underground Was Built and How It Changed the City Forever por Christian Wolmar
- Under the Sidewalks of New York: The Story of the Greatest Subway System in the World por Brian J. Cudahy
- Underground to Everywhere: London's Underground Railway in the Life of the Capital por Stephen Halliday