A collection of essays on education and humanity from the "Otoko wa Tsurai yo" (Tora-san) series, published as Iwanami Booklets. Tora-san's Theory of Humanity, first edition 1990 Tora-san's Theory of Education, 20th printing 1994 Tora-san's Theory of School, first edition 1993 All books show signs of aging on the covers and back covers, including scuffing, yellowing, and minor corner wear. The pages have some yellowing, but there are no markings or folds. They are relatively clean. This is a set of three books. Thank you for looking.