Tex. Parks & Wild. Code § 86.017
(a) Except as provided by Subsection (b), funds collected by the commission from the sale of marl, sand, gravel, shell, and mudshell may be used for:
(b) No less than three-fourths of the proceeds from the sale of marl, sand, gravel, shell, and mudshell, after the payment of refunds, shall be used for:
Acts 1975, 64th Leg., p. 1405, ch. 545, Sec. 1, eff. Sept. 1, 1975.
Acts 2019, 86th Leg., R.S., Ch. 1286 (H.B. 1824), Sec. 1, eff. September 1, 2019.