From Irish authors and Irish wit to beer guides and theories about luck, we’ve found a list of books that are just as valuable as the pot of gold at the end of the rainbow. Fictional Four-Book Clover: Saints for All Occasions by J. Courtney Sullivan Nora and Theresa Flynn are twenty-one and seventeen when they leave their small village in Ireland and journey to America. Nora is the responsible sister; she’s shy and serious and engaged to a man she isn’t sure that she loves. Theresa is gregarious; she is thrilled by their new life in Boston and besotted…