In order that exchanges of land may be effectuated for the purposes of sections 441f to 441i of this title, the Secretary of the Interior is authorized, in his discretion and in accordance with the provisions of sections 3111 and 3112 of title 40, to accept, on behalf of the United States, title to any land or interests in land within the exterior boundaries of the Badlands National Park as revised pursuant to sections 441f to 441i of this title, and, in exchange therefor, with the approval and concurrence of the Secretary of Agriculture, the Secretary of the Interior may patent lands of approximately equal value which were formerly set apart and reserved from the public domain within the Badlands Fall River soil conservation project, SD–LU–1. In effectuating such exchanges, in lieu of conveyances by the Secretary of the Interior, the Secretary of Agriculture may convey lands of approximately equal value within said project which have been acquired heretofore by the United States. All such exchanges shall, in all other respects, be considered as exchanges under the provisions of section 32c,1