Ireland North, Sheet 1 /
Ordnance Survey of Northern Ireland.
Belfast, Northern Ireland : The Survey,
1981.
Reprinted with admendments in 1981.
Printed by the Director at the Ordnance Survey Office, Dublin.
The inclusion of parts of the Republic of Ireland is by permission of the Minister for Finance.
Includes key to the national grid series.
Key is in English, French and German.