"Copyright Holder: United States. National Archives and Records Administration"@en . . . "Includes reports, evidence documents, investigation results, and other materials relating to the committee’s investigation on the Katyṅ Forest Massacre,1940 (Murder of the Polish officers and Polish intelligentsia)."@en . "11 microfilm reels (digitized), 35 mm\n\n44 microfiche,\n\ndigital images,"@en . . . . . . . . "U.S. House of Representatives Select Committee to Conduct an Investigation of the Facts, Evidence and Circumstances of the Katyn Forest Massacre, 82nd Congress, 1st Session (RG 233)"@en . "United States. National Archives and Records Administration"@en . "irn501454" . . .