It is curious there are essentially no resources/books by Paul Tillich here at Logos. Seemingly I am coming across his name all the time in theology books. Searching for Tillich here I come across a basically empty author page...
"Paul Johannes Tillich (1886-1965) was a German-American theologian and Christian existentialist philosopher. Tillich, along with contemporary Karl Barth, is considered by many as one of the most influential Protestant theologians of the twentieth century."
So, I buy his books (many available as ebooks) elsewhere. Would buy here if available.