Great Britain
Great Britain.War Office.General Staff.Geographical Section.
[London : War Office,
1941-43.
Special sheet, Port Edgar.
Relief shown by contours and spot heights.
23/41 SW & SE [Londonderry & environs] -- 32/35 NW & NE ; 32/37 NW,NE,SW,SE [Belfast & environs]
Compiled by the War Office.