What is the most popular Irish book?

What is the most popular Irish book? Ulysses? Thom’s Directory? The Book of Kells? The Country Girls? Who is the most popular Irish author? James Joyce? Maeve Binchy? Eoin Colfer? ... [mehr] https://www.irishtimes.com/culture/books/what-is-the-most-popular-irish-book-1.3136544