http://www.slate.com/blogs/moneybox/2015/05/22/urban_density_nearly_half_of_america_s_biggest_cities_look_like_giant_suburbs.html?wpsrc=fol_tw
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http://www.slate.com/blogs/moneybox/2015/05/22/urban_density_nearly_half_of_america_s_biggest_cities_look_like_giant_suburbs.html?wpsrc=fol_tw