Topographic base map series: GSGS 4369. Edition: 5th. Sheet: 8. Ordnance survey of Great Britain (Aeronautical map) 1:500,000 R.A.F. (war). Compiled on a modified polyconic projection based on the international 1:1,000,000 Map from the Ordnance Survey. Overprint series: GSGS 4504. Overprint drawn at G.S.G.S.(A.M.) June 1944. Sheet: Strait of Dover N.W. 49 1/2 - 1/2. Annotations: some meridians and the lower-left corner Latitude and Longitude coordinates are emphasized in green coloured pencil. Location: Research Collections, Gordon Griffith fonds.