The cover has minimal to no shelf wear and the binding is tight. The pages are clean, no underlining, writing, or coloring. 📚 Check out my shop for more science & vintage picture books! Synopsis | These simple but informative books are the perfect introduction to a variety of topics. Clear text and bright, Color Photographs bring hummingbirds, tornadoes, skyscrapers, and more to life. Each volume also includes a basic hands-on activity, bibliographical references, and addresses for related Internet sites. Four new series expand the collection this year with exciting fields trips, adorable dogs, the fascinating inner workings of the body, and the incredible history of four world-changing inventions. Plant the seeds of knowledge in your students today with this acclaimed reference collection from Smart Apple Media! b-221