Ordnance Survey Ireland One-inch Series War Office (large sheet series).
Great Britain.War Office.General Staff.Geographical Section.
[London] : War Office,
1940-
Relief shown by gradient tints, contours, and spot heights. Ed. 3 by contours and spot heights.
Includes "Diagram of grid reference letters."
Includes several editions of some sheets.
Graphic index in GSGS central file.