Section 58
SEC. 58. The lands comprised in classes (a), (b), and (c) of section fifty-six shall be disposed of to private parties by lease only and not otherwise, as soon as the Governor-General, upon recommendation by the Secretary of Agriculture and Natural Resources, shall declare that the same are not necessary for the public service and are open to disposition under this chapter. The lands included in class (d) may be disposed of by sale or lease under the provisions of this Act.