These books are a great resource for learning about the life history of the United States. To use them, simply open to the volume and page you need to read. When handling, wash your hands to avoid getting more dirt on the covers and pages. If you want to keep them in good condition, store them in a dry place away from direct sunlight. Avoid bending the pages or putting heavy objects on them. Also, be careful when flipping through the pages to prevent tearing, especially for the volume with the chipped cover.