Had a look at a WW2 German bombing map of St.Helens and Warrington yesterday it was from March '42, major factory sites were marked by a thick line. The maps were photocopies, and took ages to piece together. The bloke said he would copy them for me, but it took him 2 years to show them to me after he first mentioned them so i am not holding much hope.
There appeared to be different types of marker on different sites. It may have been a bomb symbol, but it was hard to make out. Anyone any clues