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The Dag Hammarskjold Library, being the main library of the United Nations system in view of its location at United Nations Headquarters in New York, has the unique responsibility of keeping a complete archival collection of all publications and documents issued by the United Nations, including its main and subsidiary organs and bodies. It maintains as well, comprehensive depository collections of the documentation of each of the specialized agencies and a selection of publications of United Nations and specialized agencies affiliated bodies. The Library also has a fairly complete collection of publications and documents of the League of Nations, in addition to the Woodrow Wilson Collection of books and pamphlets about the League and its period of history.