The "Lome Convention" is really a series of four trade treaties between the European Union (EU) and the ACP (African, Caribbean, Pacific) States. You can read an explanation of the Convention in the European Law Reporter. The convention was in effect from from 1975 to 2000.
Documents relating to Lome meetings were published in International Law Materials at:
Lome I (1975): 14 I.L.M. 595
Lome II (1980): 19 I.L.M. 327
Lome III(1985): 24 I.L.M. 571
Lome IV (1990): 29 I.L.M. 783.
You can pull these I.L.M. cites off Lexis using the form: Lxe xx I.L.M. xxx.
Cotonou Agreement: The Lome Convention was followed by the Cotonou Agreement, officially titled "The
Partnership Agreement Between the Members of the African, Caribbean and Pacific Group of States of the One Part, and the European Community and its Member States, of the Other Part, signed in Cotonou, Benin on 23 June 2000." (catchy, that) The Cotonou Agreement is available on EISIL.