2023 Iowa Code 123.136 – Barrel tax

2022 Iowa Code 123.136 – Barrel tax

2020 Iowa Code 123.136 – Barrel tax

2018 Iowa Code 123.136 – Barrel tax

2016 Iowa Code 123.136 – Barrel tax

2014 Iowa Code 123.136 – Barrel tax.

2009 Iowa Code 123.136 – Barrel tax