The letters from Berta Knoch to her sister, Carolina Taitz, were donated to the United States Holocaust Memorial Museum by Carolina Taitz during her survivor interview with the United States Holocaust Memorial Museum Oral History Department. English translations of the Latvian originals were provided by Taitz at the time of her oral history interview. The letters were initially given to the United States Holocaust Memorial Museum Collections Department but were later transferred to the United States Holocaust Memorial Museum Archives in Mar. 1991 by Lisa Topelmann.