Section 8. Location and disposition of public lands. It shall be the duty of the state board of land commissioners to provide for the location, protection, sale or rental of all the lands heretofore, or which may hereafter be granted to or acquired by the state by or from the general government, under such regulations as may be prescribed by law, and in such manner as will secure the maximum long term financial return to the institution to which granted or to the state if not specifically granted; provided, that no state lands shall be sold for less than the appraised price. No law shall ever be passed by the legislature granting any privileges to persons who may have settled upon any such public lands, subsequent to the survey thereof by the general government, by which the amount to be derived by the sale, or other disposition of such lands, shall be diminished, directly or indirectly. The legislature shall, at the earliest practicable period, provide by law that the general grants of land made by congress to the state shall be judiciously located and carefully preserved and held in trust, subject to disposal at public auction for the use and benefit of the respective object for which said grants of land were made, and the legislature shall provide for the sale of said lands from time to time and for the sale of timber on all state lands and for the faithful application of the proceeds thereof in accordance with the terms of said grants; provided, that not to exceed one hundred sections of state lands shall be sold in any one year, and to be sold in subdivisions of not to exceed three hundred and twenty acres of land to any one individual, company or corporation. The legislature shall have power to authorize the state board of land commissioners to exchange granted or acquired lands of the state on an equal value basis for other lands under agreement with the United States, local units of government, corporations, companies, individuals, or combinations thereof.