464 PUBLIC LAWS-CHS. 480 , 481-JTJNE 16, 1948 [62 STAT. the principal and interest on revenue bonds issued for financing such costs, and such portion of the aggregate cost not yet amortized of the said bridges across the Susquehanna River and the Potomac River included in the project, and their approaches, including reasonable interest and financing costs, as soon as possible under reasonable charges but within a period not exceeding forty years from the date of completion of the last completed structure or facility included in Adtmnt of tolls the project. Within the afore-mentioned period of forty years, tolls may be charged and continued to be charged for the use of any of the structures or facilities included in any such project and adjusted at such rates as may be necessary to provide a fund sufficient to pay any revenue bonds, with interest thereon and any lawful premium for the retirement thereof before maturity, heretofore or hereafter issued for the financing of such project or any of the structures or facilities included therein, or for the refunding from time to time of said bonds, or any of them, or of any such refunding bonds. Nothing in this Act shall be construed as authorizing tolls to be charged for the use of any one or more of the hereinabove named structures or facilities for the purpose of financing any structure or facility not authorized by Maten oe this Act and by said Act of April 7, 1938. idtge. aS e SE. 4. After a sinking fund sufficient to amortize the cost of the structures or facilities in any such project and sufficient to pay the principal and interest and any lawful retirement premium on revenue bonds issued as aforesaid with respect to such project shall have been so provided the structures or facilities included in such project shall be maintained and operated free of tolls. RSEC. 5. The right to alter, amend, or repeal this Act is hereby expressly reserved. Approved June 16, 1948. June 16, 1948 [S. 22165 [Public Law 655] National Heart Act. Poet, p. 1032 . 58StaL.7 J 42.s. 1. C 281 esi, p. 8. / [CHAPTER 481] AN ACT To amend the Public Health Service Act to support research and training in diseases of the heart and circulation, and to aid the States in the development of community programs for the control of these diseases, and for other purposes. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That this Act may be cited as the "National Heart Act". PURPOSE SEC. 2. The purpose of this Act is to improve the health of the people of the United States through the conduct of researches, investigations, experiments, and demonstrations relating to the cause, prevention, and methods of diagnosis and treatment of diseases of the heart and circu- lation; assist and foster such researches and other activities by public and private agencies, and promote the coordination of all such researches and activities and the useful application of their results; provide training in matters relating to heart diseases, including refresher courses for physicians; and develop, and assist States and other agencies in the use of, the most effective methods of prevention, diagnosis, and treatment of heart diseases. RESEARCH AND TRAINQr SEC. 3. (a) The heading of title IV of the Public Health Service Act (42 U. S. C ., ch. 6A) is amended to read "TITLE IV- NATIONAL CANCER AND HEART INSTITUTES". (b) Title IV of such Act is further amended by inserting "PAT A- NATIONAL CANCER INSrITrET" between the heading of such title IV I t
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