| Description | Home Office ARP department circular 114/1939 - Co-operation of anti-aircraft units and RAF in ARP exercises. RAF exercises. Home Office ARP department circular No. 130/1939 - Points of interest from a combined exercise. Home Office ARP department circular No. 118/1939 - Home Office defence exercise, August 1939. Black-out exercises, July 1939, and report on exercises, and summary of discussions. |