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Over the past century, the National Library has gradually formed a graded service system for central state organs, key educational and scientific research enterprises and institutions, the public and the National Library. The National Library has a rich collection of books, inheriting the royal collections of the past dynasties since the Southern Song Dynasty. The earliest collection can be traced back to Oracle Bone Inscriptions in Yin Ruins more than 3,000 years ago. The four rare books, Dunhuang suicide note, Zhao Zang, Yongle Dadian and Ge Si Quan Shu, have attracted worldwide attention.
The National Library is the legal depository of official publications in China, the depository of dissertations designated by the State Council and the depository of United Nations materials. It is the largest collection of Chinese literature in the world and the largest collection of foreign literature in China. By the end of 20021,the total collection of literature exceeded 42.3 million volumes, and the total storage of digital resources was nearly 2500TB.