Which book explains the concept of Rank Size Rule?

The Rank Size Rule has been covered very well in Cities Urbanisation book by K.Siddhartha.

This book is publish by Kitab Mahal.

To know more about this book visit our website. 

Website for Geography Books

How much time does it take to complete the geography optional for the UPSC CSE?

Hi nice question but i must say it depends on two or three things first one is ur learning skills, second one is your choice of book and third one is your mentor for Geography.

These things matter that how much time you take to complete the Geography Optional for the UPSC CSE.

Here is some info for you.

Please read Geography Books by K.Siddhartha Sir.

If you wan some another info about books you can visit here

Books For Upsc Geography Optional