United States Holocaust Memorial Museum Collection, RG-15.053M / Main Commission for the Investigation of Crimes Against the Polish Nation - Institute of National Memory, 158 Source of acquisition is the Instytut Pamięci Narodowej-Komisja Ścigania Zbrodni przeciwko Narodowi Polskiemu (IPN), Warsaw, Poland, Sygn.158. The United States Holocaust Memorial Museum acquired the microfilms in1994.