Total 10 Volumes: Science, Plants, Human Body, Wild Animal, Planet Earth, Geography, Space, Buildings & Transport, Ancient History and Modern History. The fact in each book are cover in 100 topics. For general knowledge. Ideal for young reader who like to read and gain knowledge. Condition: 7/10 Selling $40 for 10 books, able to nego. Meetup at SengKang MRT station or NE Line station can be arranged.