Analysis of information sources in references of the Wikipedia article "Zhongzhou Reef" in English language version.
Scholarly accounts indicate that the 1947 map, titled 'Map of South China Sea Islands', originated from an earlier one titled 'Map of Chinese Islands in the South China Sea' (Zhongguo nanhai daoyu tu) published by the Republic of China's Land and Water Maps Inspection Committee in 1935, and that Chinese maps produced after the establishment of the People's Republic of China in 1949 'appear to follow the old maps'.