India year book 2011 published by the Publications Division is a compendium of information relating to the country and will be very useful for students, researchers and anyone interested in knowing about India.
The book is priced at more than 300 Rupees (MRP) but is also available free of cost at the website of the publications division for downloading in pdf format. Presently it seems that the book is only available in the English language and the Hindi version may be posted later.
This book is a wealth of authentic, official information on India and should must be used by students, interview aspirants and foreigners and observers wanting to know more about India.
The UPSC aspirants study this book more than any other group of people.
You can visit the website of the publications division to download the book.
UPDATE: DOWNLOAD LINK NEW Download the India Year Book from this link on mediafire. (tip by bnpsingh).
UPdate: See this link to download if the mediafire link does not work.