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metros-keeping-pace-21st-century-cities
metros-keeping-pace-21st-century-cities
http://www.uitp.org/metros-keeping-pace-21st-century-cities
List of metro systems
Medium-capacity rail transport system
Link from a Wikipage to an external page
metros-keeping-pace-21st-century-cities
http://www.uitp.org/metros-keeping-pace-21st-century-cities