I just returned. Our PD had a few books available on the coach for us to browse through while riding. I began reading a small book, A Pocket History of Ireland, but didn't have time to finish. I bought it at the National Museum in Dublin for 4.99 euros (fabulous museum with a nice cafe).
The book is hard cover (5" x6", 225 pages) too heavy for a pocket, but high quality paper and illustrations. The history begins with the tomb builders and ends with contemporary culture -- song, dance, poetry.
Off topic, but wish I'd brought: jeans. Thrilled I brought: rain jacket with hood.