Editors. "Katyn Massacre". The Literary Encyclopedia. First published 01 May 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=7178, accessed 29 May 2015.]
Members of the Soviet Politburo sign an order, prepared by Lavrenti Beria, for the execution of 25,700 Polish intelligentsia, including 14,700 Polish POWs.
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