Pub. L. 90-351, tit. I, pt. C, sec. 306

Sec. 306. Funds appropriated to make grants under this part for a fiscal year shall be allocated by the Administration among the States for use therein by the State planning agency or units of general local government, as the case may be. Of such funds, 85 per centum shall be allocated among the States according to their respective populations and 15 per centum thereof shall be allocated as the Administration may determine, plus such additional amounts as may be made available by virtue of the application of the provisions of section 509 to the grant to any State.