These are specially made GK books by Rajhauns in a set of 4 books, namely Yellow, Green, Voilet, & Magenta.

Each book is unique and covers diverse topics related to Goa, India and the world.

Etc..

The Green Book covers

Governors and Lt. Governors

Reptiles

States and Symbols

Indian States and their Folk Dances

Major Volcanoes

Commonwealth Games