The Wiener Library for the Study of the Holocaust and Genocide, Persecution of Jews in Poland: reports and statements (coll. 532), 192. Original in Yiddish.
Combined testimony of two brothers from Ostrów Mazowiecka on the massacre of 561 Jews in their hometown committed by the Germans on November 9, 1939.
The Wiener Library for the Study of the Holocaust and Genocide, coll. 532, protocol no. 6. Original in Yiddish.
Brief testimony of Leyb Blumberg, recorded on 16 November 1939 and describing his flight from Warsaw to Vilnius in October 1939, during which he and his fellow travelers were not bothered by German troops. They reached Vilnius without difficulty.