The following links show the official records that UVA Library has in its print collections. The resolutions (not all records) can be found online, in different places. Try General Assembly Documents and Security Council Documents from the UN to help in locating more recent materials.
Shannon Library owns the Official Records and many other UN documents in microfiche as well as paper copies. The fiche collection is in Ivy Stacks and covers 1948-2013. (The UN's Official Documents System has full-text documents from 1992 on.)
The UN microfiche are arranged according to the United Nations own numbering system. They are basically filed alphabetically with numbers coming before letters, e.g., A/45/273.