For the purpose of consolidating and thereby facilitating administration and accounting the Secretary of Agriculture is authorized to designate in the several counties in which the lands described in section 2631 of this title are situated (such designation to be published in the Federal Register), an area of national-forest land of a value substantially equal to the value of the lands in such county from which all revenues shall be disposed of in accordance with the provisions of title II of the Act of August 28, 1937 (50 Stat. 874), and upon such designation the provisions of that Act shall be applicable to the lands so designated in lieu of the lands described in section 2631 of this title: Provided, however, That such designation shall not become effective until approved by the county court of the county in which the lands are located.