Ordnance Survey Northern Ireland 1:50,000 Series : 1st edition.
Great Britain.Ordnance Survey.
Belfast : Ordnance Survey of Northern Ireland,
1978-1985.
Relief shown by contour lines.
Sheet 4. Coleraine (1980) -- Sheet 5. Ballycastle (1979) -- Sheet 7. Londonderry (1982) -- Sheet 8. Ballymoney (1980) -- Sheet 9. Larne (1978) -- Sheet 12. Strabane (1985) -- Sheet 13. The Sperrins (1984) -- Sheet 14. Lough Neagh (1981) -- Sheet 15. Belfast (1980) -- Sheet 17. Lower Lough Erne (1981) -- Sheet 18. Enniskillen (1984) -- Sheet 19. Armagh (1980) -- Sheet 20. Craigavon (1983) -- Sheet 21. Strangford Lough (1982) -- Sheet 26. Lough Allen (1984) -- Sheet 27. Upper Lough Erne (1982) -- Sheet 28. Monaghan (1982) -- Sheet 29. The Mournes (1983).