Editorial Notes Codification Sections 1431 to 1435, relating to the sale of public lands subject to unintentional trespass, were omitted pursuant to section 1435 of this title , which provided for an expiration date three years after September 26, 1968 , with certain exceptions. Section 1431, Pub. L. 90–516, § 1 , Sept. 26, 1968 , 82 Stat. 870 , authorized Secretary of the Interior to sell at public auction any tract of public domain not exceeding a certain size which was subject to unintentional trespass. Section 1432, Pub. L. 90–516, § 2 , Sept. 26, 1968 , 82 Stat. 870 , related to preference rights of contiguous landowners. Section 1433, Pub. L. 90–516, § 3 , Sept. 26, 1968 , 82 Stat. 870 , related to continuing liability for unauthorized prior use. Section 1434, Pub. L. 90–516, § 4 , Sept. 26, 1968 , 82 Stat. 870 , related to acreage limitations. Section 1435, Pub. L. 90–516, § 5 , Sept. 26, 1968 , 82 Stat. 870 , provided that authority granted by this subchapter expire three years from Sept. 26, 1968 , except that sales for which application had been made in accordance with this subchapter prior to expiration of that period could be consummated and patents issued after expiration of that period.