Stamps of British India and It's States
by Balakrishna Chadalawada
This book gives a view of philatelic history of all of the known entities in British India. In total, along with the British, 34 States situated in current day India issued their own stamps and 6 Princely States used British stamps overprinted with their names(Convention States). Along with these, there are some unissued stamps and Azad Hind Cinderellas.