A set of problem books and lecture books to deepen understanding of politics and economics. - Title: Hatakeyama's Spat-to-Tokeru Politics and Economics Refreshing Problem Collection / Hatakeyama's Spat-to-Wakaru Politics and Economics Refreshing Lectures (2-book set) - Author: So Hatakeyama, Z-kai - ISBN: 978-4-86792-107-0 - ISBN: 978-4-86792-108-7 - Edition: Revised 4th Edition - Edition: Revised 6th Edition These are slightly older revised editions, but there are no markings. Includes a red sheet that fits the page size. Please consider this if you understand that this is a used item. Thank you for looking.