03/28/1938
https://www.presidency.ucsb.edu...
"By virtue of the authority vested in me as President of the United States, and subject to all valid existing rights, it is ordered that the following-described public lands be, and they are hereby, wi..."
"Subject to valid existing rights, the public lands on Amaknak Island, Alaska, comprising approximately 1,930 acres, are hereby withdrawn from all forms of appropriation under the public-land laws."
"I do prescribe the following: Executive Order No. 8389 of April 10, 1940, as amended, is amended to read as follows:"
"The Secretary of the Treasury may investigate, regulate, or prohibit under such regulations, rulings, or instructions as he may prescribe."