https://www.dipublico.org/4110/award-of-her-majesty-queen-elizabeth-ii-for-the-arbitration-of-a-controversy-between-the-argentine-republic-and-the-republic-of-chile-concerning-certain-parts-of-the-boundary-between-their-territories/
Award of Her Majesty Queen Elizabeth II for the Arbitration of a Controversy between the Argentine Republic and the Republic of Chile concerning certain Parts of the Boundary between their Territories. Foreign Office - London Her Majesty's Stationery Office 1966