Maps of Bangor on Bangor Civic Society Website....
http://www.bangorcivicsociety.org.uk/pages/hisso/index.htm#mapsInclude:
* John Speed's (1610) *
* Ordnance Survey - Boundary Map (1831)
* John Wood's (1834) *
* Tithe Map (1840) *
* Tithe Map of Ownership (1840)
* Tithe Map of Occupancy (1840)
* Tithe Map (1851) *
* Locations of the Friary & Friars School (prior to 1900)
* Ordnance Survey (1905) *
* City Guide Map (1940?s)
* Environs of Bangor (c1950)
* UCNWB College Estate Map (1959)
* Tourist Map (1975)
* Penrhyn Port Map (1890)
* Diocese Map
* - good if you're looking for specific Buildings