City dwellers (1) Urban transportation (1) Discussion (1) Chronology, Historical (1) Technique (1) Research (1) Cronología histórica (1) Transportes urbanos (1) Investigación (1) Recherche (1) Chronologie historique (1) Citadins (1) Chroniques (1) Recherche (1) Discussion (1) Technique (1) Transports urbains (1) technologie (1) recherche (1)