Let's say, next week, the world went boom. Society collapses, social order goes goodbye, leaving only you, a few other folks, and a magic bookshelf full of books. These books are the key to rebuilding modern civilization, or at the very least preventing you and your friends from starving to death. What manuals, technical books, or practical application books would you like to have in this library?
Skip the philosophy; looking for practical books (fundamentals of gardening or farming, practical chemistry, electronics manuals, etc).