Physical description
Signal Letters of British Ships 1941
For the use of ships at sea and signal stations for 1941.
Has 7 Supplments - Corrected to 31 January, 1941- 28th February, 1941- 31st March, 1941- 30th April, 1941 - 30th June,1941-30th September, 1941 - 31st December, 1941
Publisher: His Majestys Stationery Office