The county assessors shall preserve in their respective offices records to show when each parcel of real property was last appraised. Each parcel of real property shall be appraised using a method of appraisal approved by the Department of Revenue by rule. [1955 c.575 §1; 1967 c.105 §1; 1967 c.293 §8; 1997 c.541 §161]
