'Military Security – Refugees: Internment: Fifth Columnists', p.2, encl. with Director of Military Operations and Intelligence to all commands, 31 October 1940.
NAA: MP729/6, 29/401/273, p.2
A report called 'Military Security – Refugees: Internment: Fifth Columnists', 31 October 1940, in the secret correspondence files of the Department of the Army.
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