How to use: Simply open the books and start reading. These books are great for casual learning about bird anatomy or for more in - depth study. You can flip through the pages to find specific topics or read them cover - to - cover. Notice: Since these are old books from 1972, handle them gently to avoid further wear. Don't bend the pages too much and keep them away from liquids. Maintenance: Store the books in a dry and cool place. You can use a bookend to keep them in shape. If they get a bit dusty, gently wipe them with a soft, dry cloth.