Mo. Rev. Stat. § 2.010: Original laws to be deposited in office of secretary of state.

The original rolls of all laws and joint and concurrent resolutions passed by each general assembly shall, immediately after the passage thereof, be deposited in the office of the secretary of state, and every bill and resolution presented to the governor for his approval, and returned by him to the house in which it originated with his approval thereon, shall, immediately after such return, be deposited by the secretary of the senate, or by the chief clerk of the house, as the case may be, in the office of the secretary of state.