This primary source comes from the Records of the Central Intelligence Agency.
Full Citation: The British Empire and Commonwealth; ca. 1950; Published Maps, 1947 - 2015; Records of the Central Intelligence Agency, Record Group 263; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/the-british-empire-and-commonwealth, May 5, 2024]