2024 Iowa Code 456.1 – Iowa geological survey created

2023 Iowa Code 456.1 – Iowa geological survey created

2022 Iowa Code 456.1 – Iowa geological survey created

2020 Iowa Code 456.1 – Iowa geological survey created

2018 Iowa Code 456.1 – Geological survey created — definitions.

2016 Iowa Code 456.1 – Geological survey created

2014 Iowa Code 456.1 – Geological survey created – definitions.

2009 Iowa Code 456.1 – Geological survey created — definitions