Whenever the quantity of public land remaining unsold in any land district is reduced to a number of acres less than one hundred thousand, it shall be the duty of the Secretary of the Interior to discontinue the land office of such district; and if any land in any such district remains unsold at the time of the discontinuance of a land office, the same shall be subject to sale at some one of the existing land offices most convenient to the district in which the land office has been discontinued, of which the Secretary of the Interior shall give notice.
43 U.S. Code § 122. Discontinuance of land offices by Secretary of the Interior
For transfer of functions of other officers, employees, and agencies of Department of the Interior, with certain exceptions, to Secretary of the Interior, with power to delegate, see Reorg. Plan No. 3 of 1950, §§ 1, 2, eff. May 24, 1950, 15 F.R. 3174, 64 Stat. 1262, set out under section 1451 of this title.