Every instrument in writing affecting real estate, or the adoption of minors, which is acknowledged or proved and certified as required, may be read in evidence without further proof. [C51, §1227; R60, §2235, 4001; C73, §3659; C97, §4629; C24, 27, 31, 35, 39, § 11289; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §622.36 ]