Maps and plans relating to the Second World War > A set of 1928 edition Ordnance Survey maps of the Hull area (scale 1:2500) indicating war damaged properties compiled just after the Second World War. They are colour and letter coded. A key does not survive but the following seem to apply: Yellow =House Brown =Public Building Green =Shops Blue =Industry > 1928 edition Ordnance Survey map of the Hull area (scale 1:2500) indicating war damaged properties compiled just after the Second World War. This map is colour and letter coded. A key does not survive but the following seem to apply: Yellow =House Brown=Public Building Green=Shops Blue=Industry