7 U.S.C. § 301

There is granted to the several States, for the purposes hereinafter mentioned in this subchapter, an amount of public land, to be apportioned to each State a quantity equal to thirty thousand acres for each Senator and Representative in Congress to which the States are respectively entitled by the apportionment under the census of 1860: Provided, That no mineral lands shall be selected or purchased under the provisions of said sections.