The Secretary of the Interior is authorized, in his discretion, to approve and accept, on behalf of the United States, title to any lands and interests in land heretofore or hereafter conveyed to the United States for the purposes of the Blue Ridge or the Natchez Trace Parkways, or for recreational areas in connection therewith.
(June 30, 1936 ch. 883, §3, as added June 8, 1940, ch. 277,