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 the aforesaid Migratory Bird Treaty Act of July 3, 1918, do hereby approve and proclaim the foregoing regulation of the Acting Secretary of the Interior.
Context
Proclamation 2758—Closed Area Under the Migratory Bird Treaty Act: Florida
12/01/1947