Under the Act of November 7, 1996 on Legal Deposit Copies, the National Library receives two copies of books and serials and other publications: newspapers, printed music, atlases, maps, ephemera, electronic publications, recorded sound and audiovisual documents. The Library receives 180,000 published items of various types yearly, including ca. 90 percent on legal deposit. The library also expands its collections by purchase, by gift and by exchange with other domestic and foreign libraries. The National Library holdings as of the end of 2014 (including duplicates) totalled over 9 887 831 registered items.