Articles, affidavits, publications and correspondence of L. Koniuchowsky with various organizations after the war Includes: 1. Confirmation by the Union of the Lithuanian Jews in Germany dated 21 March 1948 declaring that Leib Koniuchowsky has been collecting material on the extermination of Lithuanian Jewry for more than two years. 2. Correspondence conducted by Koniuchowsky with the board of trustees of the Lithuanian Jewry Research Institute in Munich on 22 May 1949 and 30 June 1948 concerning a historical survey to be prepared on the extermination of Lithuanian Jewry. 3.Statement issued by the Conference of Jewish Material Claims Against Germany in New York concerning the publication of testimonies collected by L. Koniuchowsky. 4. Letter dated 06 April 1948 from Dr. Philip Friedman, Munich, to Mark Yudel, New York, regarding compilation of testimonies from Lithuanian towns by L. Koniuchowsky. 5. Correspondence of Koniuchowsky with YIVO, New York, and with the Association of Lithuanian Jews in Israel.