may be used to pay any salary or expense in connection with any publication, or preparation of material therefor (except the Digest of Public General Bills), to be issued by the Library of Congress unless such publication has obtained prior approval of either the Committee on House Administration of the House of Representatives or the Committee on Rules and Administration of the Senate. Books for the Blind and Physically Handicapped salaries and expenses For all necessary expenses to carry out the Act of March 3, 1931 (chapter 400