Mt. Vernon lists them here. It's an interesting list; I don't think it sheds much light on what GW exactly believed regarding his religious specifics. I've seen both sides of the debate try to make hay of the list. D. James Kennedy et al. focused on all of the pious sermons in the list. Indeed Kennedy liked to tell people how GW was a "collector of sermons." And the skeptics focused on the works of Joseph Priestley and the other "infidel" philosophers.
Much of the contents of said library were given to GW.