This primary source comes from the National Archives Collection of World War II War Crimes Records.
Full Citation: Jewish civilians of Warsaw, Poland being escorted to Umschlagplatz ; 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://www.docsteach.org/documents/document/jewish-civilians-warsaw-poland-umschlagplatz, May 15, 2024]