Executive Order 3363—Ponca Indians in Oklahoma
It is hereby ordered, under authority found in the act of June 21, 1906 (34 Statutes at Large, pages 325 and 326), that the trust period on the allotments of the Ponca Indians in Oklahoma, which trust period was extended for one year by Executive order of September 19, 1920, be, and is hereby, extended for a further period of twenty-five years.
The White House,
December 1, 1920
Woodrow Wilson, Executive Order 3363—Ponca Indians in Oklahoma Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/276585