This map reproduced from the 1964 edition of Encyclopaedia Britannica is said to have been prepared by the US CIA and is dated 1959. It is something I published to accompany my November 5 2007 article “China’s India Aggression”. The Government of India and Government of China have a hard time with maps in discussing the boundary-dispute; this might help them.
Readers are welcome to quote from my work under the normal “fair use” rule, but please quote me by name and indicate the place of original publication in case of work being republished here. (The search engine above should locate any article by its title; the Index and Archives may be used as well). Feel free to introduce yourself. https://www.facebook.com/subyroy. Also, I should be grateful to know of any errors. drsubrotoroyAThotmail.com.