"______ being duly sworn, makes oath and says that such person has made diligent efforts to ascertain all the taxable property being or situate, on the first day of January last past, in the county of which such person is assessor; that, so far as such person has been able to ascertain the same, it is correctly set forth in the foregoing book, in the manner and the value thereof stated therein, according to the mode required by law".
§ 137.245, RSMo
RSMo 1939 § 10990, A.L. 1945 p. 1782 § 39, A.L. 1959 H.B. 108, A.L. 1976 H.B. 1162, A.L. 1994 S.B. 652, A.L. 2002 H.B. 2018, A.L. 2008 S.B. 711