If you could own a physical copy of just one book, what would it be and why? I asked this question last month and got a wide-variety of answers. Not surprisingly, several people chose the Bible, a single book that served the vast majority of people since the dawn of book publishing and ownership just fine. Other top must-haves for the digital age included cookbooks and other guides, marked-up editions, collections, and a random assortment of personal favorites, including memoirs, social analyses, and fiction.