Executive Order 5539—Extension of Trust Period on Allotments on Ponca Indians, Oklahoma
It is hereby ordered, under authority contained in section 5 of the act of February 8, 1887 (24 Stat. 389), that the trust period on the allotments made to Indians of the Ponca Reservation in Oklahoma, which trust period expires during the calendar year 1931, be, and is hereby, extended for a period of 10 years.
The White House,
January 23, 1931.
Herbert Hoover, Executive Order 5539—Extension of Trust Period on Allotments on Ponca Indians, Oklahoma Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/276848