"Train Your Thinking Skills: Fermi Estimation for Problem Solving" 1600 yen + tax "Manga Guide to Train Your Thinking Skills" 1300 yen + tax Isao Hosoya Condition: Purchased from a used bookstore in 2025. I chose a clean copy at the time of purchase. Although it is a used item, there are no stains that would be a problem when reading the text. ● Cover: Yes ● Sunburn: None ● Creases: None ● Scratches: Fine scratches on the cover ● Folds: None ● Writing: None ● Other notes: You can purchase this item immediately. Please consider this item with the understanding that it is a used item. (There may be oversights in the condition.) [Shipping Method] Yu-Yu Mercari Delivery I will use Yu-Packet Post. The book will be wrapped in vinyl and packaged in a kraft envelope, and then posted in a mailbox. (I will inform you of the mailbox collection time after posting. No reply is needed.) Also, smaller items may be shipped in a Yu-Packet Post mini dedicated envelope.