Also, Select Committee of the US Congress final report: "The Katyn Forest Massacre", House Report No. 2505, 82nd Congress, 2nd Session (22 December 1952) online pdf Archived 9 February 2006 at the Wayback Machine, unofficial reproduction of the relevant parts.
Also, Select Committee of the US Congress final report: "The Katyn Forest Massacre", House Report No. 2505, 82nd Congress, 2nd Session (ngày 22 tháng 12 năm 1952) online pdf, unofficial reproduction of the relevant parts.