GSGS (Series) ; 3957. 4th ed. Transverse Mercator proj. "First published by the Director General, at the Ordnance Survey Office, Southampton, 1935, with periodical corrected reprints." "Air information correct to 20.11.39." Stamped in red, "Not to be published." Stamped, "Orderly Room, 3, CDN. Construction, COY., R.C.E."
