Feds are trying to buy in Tx to increase the Big Thicket National Corridor and majority of state land has been donated or is in trusts held by the University of Texas and Texas A&M University and funds off drilling the properties funneled into the public education fund for those 2 school systems (which is low 9 figures annually now, but has been happening since the early 1900s). Some has been donated to conservation groups to keep reservoirs from being built.If you click on that Texas link and go from Region to Region, you'll see a lot of the land up for sale is private property and there is very little acerage of substance for sale in the entire state.
Some of the land donated to the state schools or state agencies to escape estate taxes is sold off in auctions. 2 years ago a family member bought a place that was donated to a state school, it was a tract that finally allowed land access to thousands of acres of public land and it went on the market quick. This all happened without public knowledge.