Series consists of letters, numbered and unnumbered code cables, clear cables, a situation report by Ambassador Herbert de Ribbing, notes on conversations, and press releases regarding hostilities between Cambodia and Thailand which led to the Secretary-General's decision to send mediators to the area.
This series relates to two missions, one headed by Nils Gussing, Special Representative to the Secretary-General from 1963 to 1964 and the other headed by Ambassdor Herebet de Ribbing, Special Representative to the Secretary-General from 1966 to 1967.
Documented are the mission's itineraries, staff matters, meetings and updates. Correspondents include Chef-de-Cabinet C. V. Narasimhan, Secretaty-General U Thant, Representives of the Permanent Mission of Thailand, Herbert de Ribbing and Nils Gussing.