Filling your Guided Reading library with all different types of books ensures readers will stay engaged and will want to keep reading. The 29 books in this list are perfect for adding variety to your Guided Reading library in nonfiction—an important text type for young readers to master. Leveled Q-R, these titles feature sophisticated vocabulary and require a sustained reading effort over several sittings. Use them as readers advance to more complex texts and to enhance lessons in science, history, and more.