Iowa Code § 446.1
The county treasurer shall designate on the county system each parcel sold for taxes and not redeemed, by noting on the county system the year in which it was sold.
[C73, §842; C97, §1386; C24, 27, 31, 35, 39, §7238; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, S81, §446.1; 81 Acts, ch 117, §1224] 91 Acts, ch 191, §58