GOV.UK, Guidance: UK Treaties links to UK Treaties Online and UK Treaty Action Bulletins
UK Parliament, House of Commons Library, EU Law and Treaties
Treaty Series (1892-) in microfilm in BLS Library
BLS Library microfilm of the UK Treaty Series ends with 1984-85 treaties. General indexes to the microfilm of the Treaty Series are in reel 31.
British and Foreign State Papers and Indexes (1841-1968) in microfilm in BLS Library
BLS Library holdings: vol. 1 (1812/14) – vol. 170 (1967/68). Index vols.: 64, 93, 115, 138,165 & 170.
EUR-Lex > Treaties Currently in Force
Provides links to the complete consolidated texts of key EU treaties.