The main bodies of the United Nations are the General Assembly, the Security Council, the Economic and Social Council, the Trusteeship Council, the International Court of Justice, and the UN Secretariat. All were established under the UN Charter when the Organization was founded in 1945. Except for the International Court of Justice which is located in the Hague, all bodies are in New York City.
Each main organ of the UN publishes its own documents and publication methods can vary. Furthermore, there are many subsidiary organizations within the UN, which publish their own documents. Subsidiary organizations are located throughout the world, many in Geneva.