Ordnance Survey maps covering the Conwy County Borough. The East side is covered by the Denbighshire County Series and the West side is covered by the Caernarfonshire County Series, with later maps part of the National Grid Series.
The collection includes:
2.5 inch: 1 mile scale: 1953; 1960; 1977
6 inch: 1 mile scale: first edition, c.1880; second edition, c. 1900; third edition, c.1914-c.1920; provisional edition 1937; c.1964; c.1978; c.1990
25 inch: 1 mile scale: first edition, c.1889; second edition, c.1900; third edition, c.1913; provisional edition, 1937; National Grid Series, c.1967-c.1977
50 inch: 1 mile scale [towns only]: first edition, c.1889; 1959; c.1976; c.1985; c.1990