This primary source comes from the Records of the Central Intelligence Agency.
Full Citation: China Communist Controlled Areas, 1945-1947; 8/1947; 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/china-communist-controlled-areas-19451947, May 17, 2024]