This lengthy report was State Department Bureau of Intelligence and Research's contribution to the first National Intelligence Estimate on the nuclear proliferation, NIE 100-6-57. Written at a time when the United States, the Soviet Union, and the United Kingdom were the only nuclear weapons states, the “Fourth Country” problem referred to the probability that some unspecified country, whether France or China, was likely to be the next nuclear weapons state. Enclosed with letter from Helmut Sonnenfeldt, Division of Research for USSR and Western Europe, to Roger Mateson, 4 June 1957, Secret

Fragment of the discussions between the delegation of the People's Republic of Mongolia led by Yumjaagiyn Tsedenbal and the Romanian government in Bucharest, 9 September 1957. Tsedenbal describes the formation of the history and current state of relations between the Mongolian and Soviet Communist parties, Mongolia's relationship with the People's Republic of China, as well as the status of economic reforms in Mongolia

Report on the main aspects of international trade for the year 1966. The report covers issues such as developing countries’ growth in exports, the trade balances of various Western countries, East-West trade, and trends for 1967.