Com va crear-se i crčixer la malla urbana de Manhattan <a href="http://www.nytimes.com/interactive/2011/03/21/nyregion/map-of-how-manhattan-grid-grew.html?hp">http://www.nytimes.com/interactive/2011/03/21/nyregion/map-of-how-manhattan-grid-grew.html?hp</a><br>
<br>Raf<br>