Boulogne-Dunkirk (special).
Great Britain.Army.Army Group, 21st
[London : War Office,
1944]
"21 A Gp No. 9".
Base map: "Parts of sheets 1, 5 & 6 G.S.G.S. 4336".
In top left margin: N.W. France 1:100,000.
"1000/3/44. 15 M.R.S./123/1"