Versions of Iowa Code 16.64 - Bonds and notes -- tax exemption on LawServer 2024 Iowa Code 16.64 – Bonds and notes — tax exemption 2023 Iowa Code 16.64 – Bonds and notes — tax exemption 2022 Iowa Code 16.64 – Bonds and notes — tax exemption. 2020 Iowa Code 16.64 – Bonds and notes — tax exemption. 2018 Iowa Code 16.64 – Bonds and notes — tax exemption. 2016 Iowa Code 16.64 – Bonds and notes