"One of the helpful things about the mass of UN documentation is that it is well-organized, even though it is voluminous. Every conference that has ever been held, including those which resulted in a draft treaty, has been assigned a unique number. Once one discovers this number, one can use the fee-based Official Document System database (for treaties negotiated after 1992), , in order to call up the documents of that conference.
There have been major and minor conferences, and not all of these are listed on the web site, but major ones are listed at the UN-I-QUE (UN Info Quest) service in the documentation page of the UN web site..." Marylin Raisch, Travaux Preparatoires and United Nations
Treaties or Conventions: Using the Web Wisely, 30 Int'l J. Legal Info 324-330 (2002)