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The minutes of the Council are part of the League of Nations Official Journal, and the minutes of the Assembly are part of the League of Nations Official Journal, Special Supplement. The two collections are available in the national libraries, as well as in the main universities libraries. The League of Nations Official Journal is also available through the database HeinOnline (Ask your library for it): http://home.heinonline.org/
At the moment, only the documents distributed to the Council "C" (e.g. C.395.1928.V), and the documents distributed to the Council and to the States Members "C...M" (e.g. C.196.M.70.1927.V) are available online, through the UN documents search engine. The reference of the documents can be found in the guide: League of Nations Documents and Serial Publications, 1919-1946.
The League of Nations Archives consist of the original files of the Secretariat of the League, such as correspondence, draft reports and internal communications, as well as the official documents and publications of the League, the records of external League offices and commissions, and photographs and other visual materials, covering 1919-1946. In addition, the Archives maintain records of organizations and individuals involved in international peace movements and personal papers of figures associated with the League, its work and international issues of the time, spanning 1870-1986. The UNOG Archives contain the records of UNOG itself, as well as the records from some individuals and UN-related agencies headquartered in Geneva, most notably the Economic Commission for Europe. These materials date from 1945 to the present. More detailed information is available in the catalog and in the Archives Research Guides.