Abbeville-Boulogne (special).
Great Britain.Army.Army Group, 21st
[London : War Office,
1944]
"21 A Gp 23".
Base map: "Parts of G.S.G.S. 4336 sheets 5, 6, 9D, 10".
In top left margin: France 1:100000.
"600/MAR/44/16 M.R.S./283/76"