Dr. Sinha had donated his collection of around 50,000 rare books, bearing his autograph — including copies of Manu Smriti, Sacred Books of the East edited by F Max Muller, Koran, Buddhist suttas, a copy of original Indian Constitution, works of Jawaharlal Nehru, history politics, literature, Arya Samaj, Buddhism, Hindu scriptures.

Some old newspapers like Harijan, published by Mahatma Gandhi from 1933 to 1948, Indian People, Bihari Times, Criterion Searchlight, Leader and Aryavarta are also preserved here along with the congress proceedings since 1885 and parliamentary debates since the inception of Parliament.

[1] The library was established in 1924 by Dr. Sachchidananda Sinha academic,writer and the president of the constituent assembly that drafted the Indian Constitution,[2] its inaugural function was attended by Sir Henry Wheeler, the then governor of Bihar and Orissa Province.

[2][3] In this hall, Dr. Sinha used to host lunches and dinner for his friends and contemporaries, which included Mahatma Gandhi, Maulana Mazharul Haque etc.

Scores of Congress working committee meetings were held here with Gandhi present in all of them.