Harry Truman actually said...
This order shall not become effective to change the status of the land until 10:00 a.m. on the thirty-fifth day after the date of this order, at which time the land shall, subject to the provisions of this order, become subject to disposal under the mining laws of the United States.
Context
Executive Order 10036—Restoration of Lands to Location and Entry Under the Mining Laws of the United States
02/09/1949