Theodore Roosevelt actually said...
I, Theodore Roosevelt, President of the United States of America, by virtue of the power in me vested by the said Act and Resolution of Congress, do hereby declare and make known that all the unallotted lands in the ceded portion of said reservation, except such as may at that time have been reserved for carrying out the provisions of said amended treaty relative to the rights of Asmus Boysen, allowing him to locate in accordance with the Government surveys not to exceed six hundred and forty acres in the form of a square, of mineral or coal lands in said reservation, and to purchase the same, will, on and after the fifteenth day of August, nineteen hundred and six, in the manner hereinafter prescribed, and not otherwise, be opened to settlement, entry, and disposition under the general provisions of the homestead, townsite, coal, and mineral land laws of the United States.
Context
Proclamation 631—Opening of the Wind River Indian Reservation in Wyoming
06/01/1906