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Credit
[Report 1966] / Medical Officer of Health, Caernarvonshire Combined Sanitary Districts (Bangor City, Conway Borough, Bethesda U.D.C., Betws y Coed U.D.C., Llandudno U.D.C., Llanfairfechan U.D.C., Penmaenmawr U.D.C., Nant Conway R.D.C., Ogwen R.D.C., Caernarvon Borough, Pwllheli Borough, Criccieth U.D.C., Portmadoc U.D.C., Gwyrfai R.D.C., Lleyn R.D.C.). Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.