The book "Yabai World History" taught by a University of Tokyo professor is no longer available. 9-book set, recommended for elementary school boys: Animal and Science Encyclopedia Set I was reading books of their favorite genres to get them to enjoy reading. An encyclopedia collection where you can learn about diverse creatures and science in a fun way. - Title: The Encyclopedia of Unfortunate Creatures - Title: The Scary Encyclopedia of the World - Title: The Yabai Science Encyclopedia - Title: The Fun Animal Encyclopedia - Title: Animal Encyclopedia - Title: Extinct. Thank you for viewing.