Australia, the Copyright Act 1968 and other state acts require that a copy of every book published in Australia be deposited with the National Library of Australia, the relevant state library for the state in which the book was published, and some states other libraries such as parliamentary and university libraries. A similar system also exists in Canada with respect to its national library, known as Library and Archives Canada, and in Québec with respect to the National Library and Archives of Québec. Since 1537, all works published in France must be deposited with the Bibliothèque nationale de France. Since 1997, it has also received deposits of digital works. Since 1661, the Swedish Royal Library has been entitled to a copy of all works published in Sweden. In Singapore, the National Library Board Act requires all publishers in Singapore to deposit two copies of every publication to the National Library Board at their own expense within four weeks from the publication date. Other countries, like the United States, do not follow this requirement. The United States does, however, require that any publisher submit two copies of a copyrightable work to United States Copyright Office at the Library of Congress – this is known as mandatory deposit – but the Library is selective about which works it retains. The international nature of the book publishing industry ensures that all significant English language publications from elsewhere in the world are also included. It also has the Federal depository libraries, which must receive a copy of all of the publications of the Government Printing Office. In addition to having a law requiring publishers to deposit books, those countries with legal deposits usually have many other incentives for a proper and speedy deposit, such as a tie-in with laws affecting copyright of the same documents, and/or a cataloguing-in-publication (CIP) service. Approximately three million new English-language books are retained by the British Library and Library of Congress each year. National bibliographic control One of the main goals of a national library is fulfilling their nation's part of the common international goal of universal bibliographic control, by ensuring the bibliographic control of all the books or book-like documents published in that particular country or talking about that particular country, in any way. The first part of the goal is usually achieved through the means of legal deposit laws or (as is the case of the United