This primary source comes from the Records of the Office of Government Reports.
Full Citation: These are the American Republics - Members of the United Nations; ca. 1942 - 1945; World War II Foreign Posters, 1942 - 1945; Records of the Office of Government Reports, Record Group 44; National Archives at College Park, MD. [Online Version, https://www.docsteach.org/documents/document/these-are-the-american-republics-members-of-the-united-nations, May 30, 2023]