61 STAT.] 80TH CONG. , 1sT SESS.- CH. 359-JULY 30, 1947 Functions Appropriation Act, 1941, and as authorized by the Acts of December 23, 1941 (Public Law 371), and June 14, 1946 (Public Law 413), $1,250,000, to remain available until expended. Hospital center, District of Columbia: For preliminary expenses, including acquisition of site, necessary in carrying out the provisions of the Act of August 7, 1946 (Public Law 648), $1,700,000, to remain available until expended: Provided, That if the site selected by the Federal Works Administrator is under Government ownership, said site shall be transferred to the said Administrator, without exchange of funds. National Institute of Mental Health: For the acquisition of site or sites, the preparation of drawings and specifications, and the perform- ance of other work for the accomplishment thereof for the National Institute of Mental Health, as authorized by section 11 of the Act of July 3, 1946 (Public Law 487), $850,000, to remain available until expended. Funds available to the Public Building Administration for con- struction shall be available for temporary services as authorized by section 15 of the Act of August 2, 1946 (Public Law 600), at rates for individuals not in excess of $35 (unless a higher rate, not exceeding $50, shall be approved by the Director of the Bureau of the Budget) per diem. PUBLIC ROADS ADMINISTRATION General administrative expenses: For the employment of persons and means, including rent, advertising (including advertising in the city of Washington for work to be performed in areas adjacent thereto), printing and binding (not to exceed $49,600), purchase of periodicals, purchase of one hundred passenger motor vehicles, health service program as authorized by Act of August 8, 1946 (Public Law 658), and the preparation, distribution, and display of exhibits, in the city of Washington and elsewhere for the purpose of conducting research and investigational studies, either independently or in cooperation with State highway departments, or other agencies, including studies of highway administration, legislation, finance, economics, transport, construction, operation? maintenance, utilization, and safety, and of street and highway trafic control; invest igat ions and experiments in the best methods of road making, especially by the use of local materials; and studies of types of mechanical plants and appliances used for road building and maintenace, and of methods of road repair and maintenance suited to the needs of different localities; for maintenance and repairs of experimental highways; for furnishing expert advice on these subjects; for collating, reporting, and illustrating the results of same; and for preparing, publishing, and distributing bulletins and reports; to be paid from any moneys available from the administrative funds provided under the Act of July 11, 1916, as amended (23 U. S . C . 21), or as otherwise provided. FEDERAL-AID HIGHWAY SYSTEM For carrying out the provisions of "An Act to provide that the United States shall aid the States in the construction of rural post roads, and for other purposes", as amended (23 U. S. C. 1 -117), including personal services in the District of Columbia, $10,288,854, to be immediately available and to remain available until expended, which sum is composed of $5,000,000, the remainder of the amount authorized to be appropriated for the fiscal year 1943 by section 1 of the Act approved September 5, 1940 (Public Law 780), and $3,171,950 54 Stat. 1036. 55 Stat. 856; 60 Stat. 267. 60 Stat. 896 . 60 Stat. 425 . 42U.S.C. 232. 60 Stat. 810. 6U.S.C. 155. 60 Stat. 903. 5U.S. O. 160. 39 Stat. 35. 42 Stat. 217 . Construction of ru- ral post roads. 39 Stat. 355; 42 Stat. 212. Ante, p. 18B. 54 Stat. 867.