Forms part of the Claims Conference International Holocaust Documentation Archive at the United States Holocaust Memorial Museum. This archive consists of documentation whose reproduction and/or acquisition was made possible with funding from the Conference on Jewish Material Claims Against Germany. From the Żydowski Instytut Historyczny im. Emanuela Ringelbluma (ŻIH), Sygn. 368. The collection was donated to ŻIH by Maria Krawczyk, a daughter of Juliusz Feldhorn, in 1991. The United States Holocaust Memorial Museum Archives received the collection from ŻIH via the United States Holocaust Memorial Museum International Programs Division in Dec. 2012.