Ordnance Survey Northern Ireland 1:50,000 Series : Discoverer.
Great Britain.Ordnance Survey.
Belfast : Ordnance Survey of Northern Ireland,
1988-
Relief shown by contours, gradient tints, hachures, and spot heights.
Legend in English, French, and German on some sheets.
Discoverer series: printed and published by Ordnance Survey of Northern Ireland, Department of Environment (NI).
From 2007 on verso: Townland map and index.
Sheet 4. Coleraine (1993 ; B [ed.] 2001 ; C ed. 2003 ; D ed. 2007) -- Sheet 5. Ballycastle (1993 ; B ed. 1999 ; C ed. 2003 ; E ed. 2009 ; F ed. 2011) -- Sheet 7. Londonderry (1991 ; B ed. 2002 ; C ed. 2004 ; D ed. 2008) -- Sheet 8. Ballymoney (B ed. 1998 ; C ed. 2002) -- Sheet 9. Larne (1989 ; B ed. 1999 ; C ed. 2002 ; D ed. 2005) -- Sheet 12. Strabane (B ed. 2001 ; C ed. 2004 ; D ed. 2008) -- Sheet 13. The Sperrins (1991 ; B ed. 1999 ; C ed. 2002 ; D ed. 2006) -- Sheet 14. Lough Neagh (1989 ; B ed. 2001 ; C ed. 2003 ; D ed. 2007) -- Sheet 15. Belfast (1988 ; B ed. 2000 ; C ed. 2003 ; D ed. 2005 ; F ed. 2011 [+ fold.] ; G ed. 2013 [fold.]) -- Sheet 17. Lower Lough Erne (1991 ; B ed. 2001 ; C ed. 2003 ; D ed. 2008) -- Sheet 18. Enniskillen (1994 ; B ed. 2002 ; C ed. 2004 ; D ed. 2007) -- Sheet 19. Armagh (1990 ; B ed. 2001 ; C ed. 2003 ; E edition 2015) -- Sheet 20. Craigavon (1989 ; B ed. 2001 ; C ed. 2003 ; F ed. 2013 [fold.]) -- Sheet 21. Strangford Lough (1989 ; B ed. 2001 ; C ed. 2004 ; E ed. 2011) -- Sheet 26. Lough Allen (B ed. 2001 ; C ed. 2004) -- Sheet 27. Upper Lough Erne (B ed. 2001 ; C ed. 2004 ; D ed. 2007 ; E ed. 2011 [+ fold.]) -- Sheet 28. Monaghan-Keady (B ed. 2002 ; C ed. 2004 ; D ed. 2008) -- Sheet 29. The Mournes (1992 ; B ed. 2001 ; C ed. 2004 ; D ed. 2008 ; E ed. 2011 [+ fold.]).