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March
Record of the conversation between the Plenipotentiary of the USSR in Great Britain I.M.Maysky with the Minister of Foreign Affairs of Great Britain E. Halifax on March 27, 1940 - regarding the resumption of Soviet-British trade negotiations, about the problem of the detention of Soviet ships
March 31, 1940
Archive of the foreign policy of the Russian Federation
Report of the leadership of the ODVO intelligence department to the head of the ODVO political department A.N. Tevchenkov on anti-Soviet propaganda in Bulgaria, the formation of new military formations in Turkey, Iran's preparation for war against the USSR, etc.
March 31, 1940
Russian state military archive
The article "German" White Book "published in the newspaper" Pravda ""
[March 31, 1940]
Russian State Archives of Contemporary History
Winter defence scheme of the naval base of the Red Banner Baltic Fleet in Libava
March 1940
Russian State Naval Archives