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 3 of the said Migratory Bird Treaty Act of July 3, 1918, do hereby approve and proclaim the foregoing amendments.
Context
Proclamation 2854—Amendments of Regulations Relating to Migratory Birds and Game Mammals
08/25/1949