1965 Bellagio Colloquium, https://www.unhcr.org/us/publications/colloquium-legal-aspects-refugee-problems-note-high-commissioner

Greetings,

I'm searching for the minutes of the 1965 Bellagio Colloquium (https://www.unhcr.org/us/publications/colloquium-legal-aspects-refugee-problems-note-high-commissioner), or any memos, minutes or documentation about that meeting. Louis Henkin was the US representative to the negotiation, but I can't find any mention of that Colloquium in his archive. As the UNHCR site shows, many important Refugee specialists were present for those 8 days of discussions, but again, I can't find memos from them concerning this period. Any help would be appreciated!