06/28/1916
https://www.presidency.ucsb.edu...
"All persons are warned against entering into any agreement, combination or conspiracy which will prevent any of said lands from selling advantageously, and all persons so offending will be prosecuted ..."
"Done at the city of Washington, this sixth day of April, in the year of our Lord Nineteen Hundred and Seventeen and of the Independence of the United States, the One Hundred and Forty-first."
"The said coal lands, if otherwise available, shall be subject to disposal under the aforesaid proclamation of September 28, 1914, at $2.00 per acre, until and including June 30, 1917, subject to the p..."
"No entry shall be allowed after that date under said proclamation for either the coal or the noncoal lands."