This is a collection of treaties and subsequent treaty actions registered with and published by the Secretariat of the League of Nations pursuant to Article 18 of its Covenant. It contains the texts of treaties and records of subsequent treaty actions published in 205 volumes of the League of Nations Treaty Series.
Available on open shelf in the International section at the Bodleian Law Library at:
Treaty Series Internat 010 LN (v.1:July:1920-v.210:Oct.1944)
The best online resource for League of Nations treaties is the HeinOnline treaty collection. (University members will need to login for remote access)
Select United Nations Law Collection from the list presented on the left. From the next page select Treaty Publications from the box at the top. The fourth title in the list is the League of Nations Treaty Series. You can search within the title, by country, treaty no. or select a particular volume from the index. Treaties are available in full text and they can be emailed or downloaded in pdf format.
The United Nations Treaty Collection, a free resource, is also available but can be difficult to navigate.