Code of Federal Regulations Title 43. Public Lands:  Interior § 43.2622.0–8 Lands subject to selection

Selections made in satisfaction of quantity and special grants can generally be made only from the vacant, unappropriated, nonmineral, surveyed public lands within the State to which the grant was made. If the lands are otherwise available for selection, the States may select lands which are withdrawn, classified, or reported as valuable for coal, phosphate, nitrate, potash, oil, gas, asphaltic minerals, sodium, or sulphur, provided that the appropriate minerals are reserved to the United States in accordance with and subject to the regulations of subpart 2093.