Thomas Kiser of Vivarium Books in Saint Paul, MN has contacted me to say "I am a used bookseller specializing in theology and pre-modern history based in Minnesota. I have recently acquired a curated collection of around 350 titles of a historical/theological nature related to Catholic and Orthodox relations, formerly belonging to Prof. James Likoudis."
I've not been uncritical of some things Likoudis has written, but that is not relevant here. The collection has a significant number of major works in theology and history, both ancient and modern, Eastern and Western. Some of these books are rare and hard to find today.
I haven't found a way to get his list posted here in a readable way. Until I do so, you should contact him directly for further details: firstname.lastname@example.org.