During World War Two, London County Council kept maps showing the damage caused to the city by German bombs. They did it by hand-colouring Ordnance Survey maps, each colour representing a certain amount of damage. Now, the BBC reports, the London Metropolitan Archives and the London Topographical Society are co-publishing the maps as an atlas, The London County Council Bomb Damage Maps, 1939-45, purchasing details for which are here. Via Here Be Dragons.