Color-Coded Maps From the London Blitz http://www.atlasobscura.com/articles/intricately-colorcoded-maps-marking-bomb-damage-from-the-london-blitz?utm_source=Atlas+Obscura&utm_campaign=06df18ba1e-Newsletter_3_14_20163_11_2016&utm_medium=email&utm_term=0_62ba9246c0-06df18ba1e-60865325&ct=t(Newsletter_3_14_20163_11_2016)&mc_cid=06df18ba1e&mc_eid=019f22cd0f