books.google.com - This volume in the Greenwood Technographies series covers urban mass transit - that is, the technologies that allow cities to move large numbers of people around. Just a few hundred years ago, the size of cities was limited by the time it took people to move from one part of the city to another. The...http://books.google.com/books/about/Urban_mass_transit.html?id=lZ6Kke0MZWwC&utm_source=gb-gplus-shareUrban mass transit
