; and including such funds as may be necessary to support American overseas research centers: Provided , That funds appropriated herein are available for advance payments to independent contractors performing research services or participating in official Smithsonian presentations. Facilities capital For necessary expenses of repair, revitalization, and alteration of facilities owned or occupied by the Smithsonian Institution, by contract or otherwise, as authorized by section 2 of the Act of August 22, 1949 (63 Stat. 623), and for construction, including necessary personnel, $317,500,000, to remain available until expended, of which not to exceed $10,000 shall be for services as authorized by 5 U.S.C. 3109 . National gallery of art Salaries and expenses For the upkeep and operations of the National Gallery of Art, the protection and care of the works of art therein, and administrative expenses incident thereto, as authorized by the Act of March 24, 1937 (50 Stat. 51), as amended by the public resolution of April 13, 1939 (Public Resolution 9, Seventy-sixth Congress), including services as authorized by 5 U.S.C. 3109 ; payment in advance when authorized by the treasurer of the Gallery for membership in library, museum, and art associations or societies whose publications or services are available to members only, or to members at a price lower than to the general public; purchase, repair, and cleaning of uniforms for guards, and uniforms, or allowances therefor, for other employees as authorized by law ( 5 U.S.C. 5901–5902 ); purchase or rental of devices and services for protecting buildings and contents thereof, and maintenance, alteration, improvement, and repair of buildings, approaches, and grounds