Here are the details of maps for Bangor:
This detailed map gives good coverage of Bangor, from Carnarvon Road and the station northward to Beach Road an Hirael.
Features includestation with sidings and track layout, engine shed, Friars School, West End, Kyffin Square area, University College, Upper Bangor, town centre with individual buildings neatly shown, Wellfield House, Hirael area, St Deiniol's Cathedral, theatre, chapels, St Mary's church, Infirmary, Victoria Park area, Normal College, library, University Hall, Bishop's Palace etc. On the reverse we include a 1910 business directory of Bangor.
The map links up with Anglesey sheet 19.11 Menai Bridge to the east. An index map is available here.