Article 24. Of each book, pamphlet, periodical, map, motion picture or other work, printed or otherwise reproduced by or for any agency of the government in an edition of five hundred (500) copies or more (except confidential matter and blank forms), fifty (50) copies shall be furnished immediately to the National Diet Library for its Official use in Tokyo and for its use in international exchange for the publications of other governments and in other international exchanges. Of such works reproduced in editions of less than five hundred (500) copies, a number of copies less than fifty (50) shall be furnished to the National Diet Library in accordance with regulations to be made by the Chief Librarian.