PUBLIC LAW 102-381—OCT. 5, 1992 106 STAT. 1411 gress: Provided further, That the Institute shall act as its own certifying officer. SMITHSONIAN INSTITUTION SALARIES AND EXPENSES For necessary expenses of the Smithsonian Institution, as authorized by law, including research in the fields of art, science, and histonr; development, preservation, and documentation of the National Collections; presentation of public exhibits and performances; collection, preparation, dissemination, and exchange of information and publications; conduct of education, training, and museum assistance programs; maintenance, alteration, operation, lease (for terms not to exceed thirty years), and protection of buildings, facilities, and approaches; not to exceed $100,000 for services as authorized by 5 U.S.C. 3109; up to 5 replacement passenger vehicles; purchase, rental, repair, and cleaning of xiniforms for employees; $298,094,000, of which not to exceed $27,579,000 for the instrumentation program, collections acquisition. Museum Support Center equipment and move, exhibition reinstallation, the National Museum of the American Indian, and the repatriation of skeletal remains program shall remain available until expended and, including such funds as may be necessary to support American overseas research centers and a total of $125,000 for the Council of 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: Provided further. That none of the funds appropriated herein shall be made available for acquisition of land at the Smithsonian Environmental Research Center before the date of the enactment of an Act authorizing the use of funds for that purpose. CONSTRUCTION AND IMPROVEMENTS, NATIONAL ZOOLOGICAL PARK For necessary expenses of planning, construction, remodeling, and equipping of buildings and facilities at the National Zoological Park, by contract or otherwise, $7,900,000, to remain available until expended. REPAIR AND RESTORATION OF BUILDINGS For necessary expenses of repair and restoration of buildings 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), including not to exceed $10,000 for services as authorized by 5 U.S.C. 3109, $24,400,000, to remain available until expended: Provided, That contracts awarded for environmental systems, protection systems, and exterior repair or restoration of buildings of the Smithsonian Institution may be negotiated with selected contractors and awarded on the basis of contractor qualifications as well as price. CONSTRUCTION For necessary expenses for construction, $16,830,000, to remain available until expended.