These medical illustration books are great for learning about the nervous and reproductive systems. To use them, simply flip through the pages to view the detailed illustrations. When handling, make sure your hands are clean to avoid further soiling the pages. Since the covers are a bit damaged, be gentle when opening and closing the books. To maintain them, store the books in a cool, dry place away from direct sunlight to prevent further discoloration. Also, try to keep them on a flat surface to avoid stress on the bindings.