Articles appearing in UN periodicals are individually indexed. Indexing of the bilateral and multilateral treaties in the UN Treaty Series is another unique feature of the Index. Documents from the six main bodies of the United Nations - General Assembly, Security Council, Economic and Social Council, Trusteeship Council, Secretariat and International Court of Justice - are indexed. Masthead documents (formerly referred to as mimeographed documents), Official Records, sales publications, limited and restricted documents, and documents emanating from sessional and standing committees, functional commissions, conferences and regional bodies are the basis of the Index. Also includes the fulltext of several thousand UN documents.