The German National Library (Deutsche Nationalbibliothek, abbreviated DNB) is the central library and national bibliographic center for the Federal Republic of Germany. Its task is to collect, archive, document and record bibliographically all German and German language publications from 1913 on, foreign publications about Germany, translations of German works, and the works of German-speaking emigrants published abroad between 1933 and 1945, and to make them available to the public. The German National Library maintains co-operative external relations on the national and international level. For example, it is the leading partner in developing and maintaining bibliographic rules and standards in Germany and plays a significant role in the development of international library standards. The cooperation with publishers is regulated by law since 1935 for the Deutsche Bücherei Leipzig, since 1969 for the Deutsche Bibliothek Frankfurt.