Proceed to legislation, preparatory acts, case law, literature.
Which article numbers correspond in new and older versions of the treaties? Some of the treaties, including the Lisbon Treaty, have tables of equivalences as an annex to the treaty text, see each treaty in EUR-Lex. These may also be included in printed treaty collections.
The Commission's COM-documents 1983-2003 no. 185 (with some gaps), can be ordered from the closed stacks of the Dag Hammarskjöld and Law library.
Bulletin of the European Union (1968-2005). Formerly the official news publication of the EU. Can be used to follow the activities of the EU institutions during a specific period, with references to the official documents. The Bulletin is kept in the EDC collection in the closed stacks of the Dag Hammarskjöld and Law library.
Preparatory working documents for the European Convention can be found on shelf Ref 341.2422 in the Dag Hammarskjöld and Law library.
The English version of the printed collection of cases from the European Court of Justice (European Court Reports) 1954-1994 is kept in the EDC collection in the closed stacks. After that only the electronic form is available.