43 U.S. Code § 566 - Maintenance of public reservations and conveyance to municipality
The public reservations in such town sites shall be improved and maintained by the town authorities at the expense of the town; and upon the organization thereof as municipal corporations the said reservations shall be conveyed to such corporations by the Secretary of the Interior, subject to the condition that they shall be used forever for public purposes.
Source(Apr. 16, 1906, ch. 1631, § 3,34 Stat. 116.)