Mo. Rev. Stat. § 170.161
Any publisher who sells, or offers for sale or adoption in this state, school textbooks of any kind without first obtaining licenses therefor under this law is guilty of a misdemeanor and upon conviction shall be fined not less than five hundred dollars and not more than five thousand dollars.
(L. 1963 p. 200 § 10-16)
(Source: RSMo 1959 § 170.260)