The National Library, Kolkata was established in 1948 with the passing of the Imperial Library (Change of Name) Act, 1948.
Central Secretariat Library:
The Central Secretariat Library (CSL) originally known as Imperial Secretariat Library, Kolkata was established in 1891. Since 1969 the Library has been housed at Shastri Bhawan, New Delhi. It has a collection of over seven lakh documents mainly on Social Sciences and Humanities. It is a depository of Indian Official Documents, Central Government and has a strong collection of State Government documents also.