GSGS (Series) ; 4370. 2nd ed., Army/Air style. "Conversion of the 1/M Great Britain (sheets N.30 and parts of N.29, N.31, M.30, and M.31) dated 1933, compiled from Ordnance Survey 1:253,400 and Admiralty charts." "Heliographed by O.S. 1942." "Originally published: "O.S., 1933."
GSGS (Series) ; 4370. 2nd ed., Army/Air style. "Conversion of the 1/M Great Britain (sheets O.30 and parts of N.29 and N.30) dated 1933, compiled from Ordnance Survey 1:253,400 and Admiralty charts." "Heliographed by O.S. 1942." "Originally published: "O.S., 1933." Includes inset: Shetland Islands.