S.A.D.E. Decca chart.
Great Britain.War Office.General Staff.Geographical Section.
[London] : War Office,
1946.
Base maps: Ordnance Survey of England and Wales. 5th ed. style. 2nd war rev. 1940.
Four proof versions of each map were printed  on 10th August
Sheet 87: Ipswich -- Sheet 107: N.E. London & Epping Forest