They are the Ultimate Reference Books. 1st book- Explore and discover the natural and man-made structures by travelling through the Famous Places around the world. Know more about the people kings and queens, scientists and soldiers. presidents and prophets who have changed the way we live through Great Lives. Lastly, the world is divided into many countries, some big and some very small, find out more about their varied cultures and customs through Children Of The World. 2nd book- A vast ocean of knowledge awaits you in this encyclopedia. Learn useful information and facts about Science All Around Us, about Great Inventions that have influenced and changed our lifestyle. And, lastly explore the mysterious darkness that envelops our Earth - Space.