This primary source comes from the National Archives Collection of World War II War Crimes Records.
Full Citation: Captured Jewish Civilians being escorted to Umschlagplatz, Warsaw, Poland; 4/1943; USA Exhibit 275; United States Exhibits, 1945–1946; National Archives Collection of World War II War Crimes Records, Record Group 238; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/captured-jewish-civilians-escorted-umschlagplatz-warsaw-poland, April 29, 2024]