The Charles Close Society for the study of Ordnance Survey maps
Digital Images Archive
GSGS 3907 England and Wales one-inch (1:63,360) Second War Revision 122, with layers
31. In 1947 the Staff College requested copies of one-inch sheets with
the addition of layers, for the training of officers. These six Second
War Revision sheets (Nos 27-32) were supplied.
From a copy in a private collection