2024 Iowa Code 309.66 – Use of gravel beds

2023 Iowa Code 309.66 – Use of gravel beds

2022 Iowa Code 309.66 – Use of gravel beds

2020 Iowa Code 309.66 – Use of gravel beds

2018 Iowa Code 309.66 – Use of gravel beds

2016 Iowa Code 309.66 – Use of gravel beds

2014 Iowa Code 309.66 – Use of gravel beds.

2009 Iowa Code 309.66 – Use of gravel beds