West Bengal Public Library Network: here you can find copy right free rare books which are under the custody of various libraries of West Bengal in India.
National Library: National Library, Kolkata has decided to open their digital collection which include digitized documents of National Library and electronic resources which is subscribed by National Library to open free access to their readers.
Digital Library of the West Bengal Secretariat: The West Bengal Secretariat Library at Writers' Building, Kolkata, is one of the oldest and largest library under Government of West Bengal. It has a traditional and historical significance. The library has a rich collection of books dm the British era till date. Some of them are very rare.