Mo. Rev. Stat. § 446.290: French and Spanish grants.

All grants and concessions of land, all warrants, orders, plats and certificates of survey made and signed by the proper officers of the French or Spanish government, which shall have been filed in the office of the recorder of land titles, by virtue of any law of the United States, and all deeds, conveyances and evidences of title made before, and signed by such officers of the French or Spanish government, which shall have been filed and recorded as aforesaid, being certified by such recorder to have been recorded in his office, shall be received in evidence without further proof.