Harry Truman actually said...
NOW, THEREFORE, by virtue of the authority vested in me by section 1 of the said act of June 29, 1940, 54 Stat. 686, the following-described tract of land is hereby added to and made a part of the Mount Vernon Memorial Highway, and shall be administered by the National Park Service, Department of the Interior:
Context
Executive Order 9851—Adding Certain Lands to the Mount Vernon Memorial Highway
05/12/1947