It is important to note the difference between documents & publications. Whether an item is one or the other will determine where it is and how you locate it.
U.N. Documentation Research Guide - Dag Hammarskjöld Library
Find voting records for resolutions & decisions adopted by the General Assembly & Security Council:
Each of the 5 permanent members of the United Nations Security Council (China, France, Russia, U.S. & U.K) have the power to unilaterally block (veto) any decision or resolution put forward by the Security Council.
Google Custom Search – Inter-Governmental Organizations
Search the websites of United Nations bodies & agencies as well as other IGOs.