This primary source comes from the Records of the Central Intelligence Agency.
Full Citation: Afghanistan Ethnic, Linguistic and Religious Groups; 7/1948; 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/afghanistan-ethnic-linguistic-and-religious-groups, April 26, 2024]