43 U.S.C. § 990

All lands in the State of Missouri selected as swamp and overflowed lands, and regularly reported as such to the General Land Office, and on March 3, 1877, withheld from market as such, so far as the same remain vacant and unappropriated and not interfered with by any preemption, homestead, or other claim under any law of the United States, and the claim whereto has not been on said date rejected by the Commissioner of the General Land Office, or other competent authority, are confirmed to said State, and all title thereto vested in said State: and it is made the duty of the Secretary of the Interior to cause patents to issue for the same.