2024 50 USC 167o – Low-Btu gas separation and helium conservation

2023 50 USC 167o – Low-Btu gas separation and helium conservation

2022 50 USC 167o – Low-Btu gas separation and helium conservation

2021 50 USC 167o – Low-Btu gas separation and helium conservation

2020 50 USC 167o – Low-Btu gas separation and helium conservation

2018 50 USC 167o – Low-Btu gas separation and helium conservation

2017 50 USC 167o – Low-Btu gas separation and helium conservation

2015 50 USC 167o – Low-Btu gas separation and helium conservation

2014 50 USC 167o – Low-Btu gas separation and helium conservation