Because it’s not just about a map, with the hotspots where explosives can be. In one bulk Of 253 pages, almost per bomb was described why it could lie there. For example, English and American bombers mainly attacked strategic points, such as railway lines and railway bridges. The station area therefore turns a lot of orange on the map. That was tackled during the war, partly because there would be trains with parts for German V2 rockets.
New Bommenkaart brings war residues in Utrecht into the picture
