"400 Wonders of the World That Expand the Intellectual World: From Small Questions to Big Discoveries!" Supervised by Akira Fujishima, President of Tokyo University of Science Price: ¥2300 #With cover "Raising Smart Kids: You Can Do It! 366 Days of Life" Supervised by Akemi Miyazato, Professor at Ochanomizu University and Kindergarten Director Price: ¥2300 #No cover These are great books, so I hate to throw them away. Shipping costs would be high for a single item, so I'd like to offer them at a lower price by selling them as a set. My child has read these. There is some soiling and creasing. However, I think they are relatively clean as you can see in the photos. Please consider purchasing these as used items."