it buys some of its books and gets others as gifts. It also gets materials through its copyright office. Anyone who wants copyright protection for a publication must send two copies to the library.
美國國會圖書館的書籍有些是購買的，有些是他人作為禮物贈送的。它也從版權管理機構獲得資料。任何想要對其出版物進行版權保護者必須送兩份副本給圖書館。
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