Lattice overprint series: GSGS 4519. Overprint drawn at G.S.G.S.(A.M.) October 1944. Sheet: Bremen N.E. 52/5 2/3. Projection: Europe (Air) conical orthomorphic (central zone). Grid amended September 1943. Topographic base map series: GSGS 4072. Edition: 2nd, 1942. Sheet: Bremen N.E. 52/6. Published by War Office 1940. Compiled and drawn at War Office 1939. Heliographed at Ordnance Survey 1940. Annotations: Latitude and Longitude parallel and meridian lines are emphasized with green coloured pencil. Possible flight path indicated in regular lead pencil lines starting and ending in lower-right margin. Location: Research Collections, Gordon Griffith fonds.