Mo. Rev. Stat. § 137.275
Every person who thinks himself aggrieved by the assessment of his property may appeal to the county board of equalization, in person, by attorney or agent, or in writing.
(RSMo 1939 § 10992, A.L. 1945 p. 1782 § 44)
Prior revisions: 1929 § 9802; 1919 § 12812; 1909 § 11394