Excerpt from protocol № 13 of the <a href="https://en.wikipedia.org/wiki/Politburo_of_the_Central_Committee_of_the_Communist_Party_of_the_Soviet_Union" class="extiw" title="en:Politburo of the Central Committee of the Communist Party of the Soviet Union">Politburo</a> session "A question to <a href="https://en.wikipedia.org/wiki/NKVD" class="extiw" title="en:NKVD">NKVD</a> USSR" (item 144). 5 March 1940. Original.
<a href="https://en.wikipedia.org/wiki/Lavrentiy_Beria" class="extiw" title="en:Lavrentiy Beria">en:Lavrentiy Beria</a>
5.3.1940
<ul><li>Российский государственный архив социально-политической истории (РГАСПИ)  Ф. 17 оп. 166  дело 621 лист 134. Подлинник. Scan from <a rel="nofollow" class="external free" href="http://katyn.ru/index.php?go=Pages&amp;in=view&amp;id=26">http://katyn.ru/index.php?go=Pages&amp;in=view&amp;id=26</a></li>
<li>This is a colour photocopy of official document legally transferred into the property of Polish Government, and first published in Poland, by Goverment of Poland in 1993.</li></ul>