Though not a body of the United Nations, the UN and EU occasionally have overlap. The following may be of use to those studying the UN:

• Delegation of the European Union to the United States 
  "The European Union is a unique economic and political partnership among 28 diverse democracies united in their commitment to peace, democracy, the rule of law, and respect for human rights. It is represented in the United States by the Washington, DC Delegation of the European Union, a full-fledged diplomatic mission working in close coordination with the Embassies and Consulates of the 28 EU Member States."
• EuroDocs 
  “These links connect to European primary historical documents that are transcribed, reproduced in facsimile, or translated. They shed light on key historical happenings within the respective countries and within the broadest sense of political, economic, social and cultural history. The order of documents is chronological wherever possible. These open access sources are readily available to all — without fees or subscriptions.”
• European Union Institutions and Bodies 
  Links to EU units. Collected by  Berkeley Library.
• European Union Internet Resources 
  From the University of California Berkeley Library.