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1940 Inter-Services Air Navigation Signal Book: Air Ministry incl. International Codes/ Download
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1940 Inter-Services Air Navigation Signal Book: Air Ministry incl. International Codes/ Download
Signal Book for use in Air Navigation.
Drawn up in Conformity with the Air Convention of 1919
International Code of Signals.
AIR MINISTRY. Publication code: A.P. 1795.
Published by HMSO,, 1940