43 U.S.C. § 330
Desert-land entry in addition to homestead entry
The right to make a desert-land entry shall not be denied to any applicant therefor who has already made an enlarged homestead entry of three hundred and twenty acres: Provided, That said applicant is a duly qualified entryman and the whole area to be acquired as an enlarged homestead entry and under the provisions of this section does not exceed four hundred and eighty acres.