Herbert Hoover actually said...
It is hereby ordered, under authority contained in Section 5 of the Act of February 8, 1887 (24 Stats. 388), that the trust period on the allotments of Indians on the Yankton Sioux Reservation, South Dakota, which expires during the calendar year 1929, be, and is hereby extended for a further period of ten years.
Context
Executive Order 5173—Extension of Trust Period on Allotments Made to Indians on the Yankton Sioux Reservation in South Dakota
08/08/1929