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 4524. Overprint drawn at G.S.G.S.(A.M.) October 1944. Sheet: Strait of Dover N.W. 49 1/2 - 1/2. Annotations: parallel and meridian lines are emphasized in black coloured pencil. "OK ; 27.16.8-1; 1 blink every 6 secs. ; A. L. Sewel (L/Sgt)" written in upper-left margin. Location: Research Collections, Gordon Griffith fonds.