Harry Truman actually said...
Now, Therefore, I, Harry S. Truman, President of the United States of America, under and by virtue of the authority vested in me by section 2 of the act of June 8, 1906, 34 Stat. 225 (16 U.S.C. 431), do proclaim that, subject to all valid existing rights, the lands within the following-described boundaries and shown on the diagram hereto attached and forming a part hereof which belong to the United States are hereby reserved and established as a national monument, to be known as the Effigy Mounds National Monument; and that the lands within such boundaries which do not now belong to the United States shall become a part of such monument upon the acquisition of title thereto by the United States.
10/24/1949