2024 42 USC 7491 – Visibility protection for Federal class I areas

2023 42 USC 7491 – Visibility protection for Federal class I areas

2022 42 USC 7491 – Visibility protection for Federal class I areas

2021 42 USC 7491 – Visibility protection for Federal class I areas

2020 42 USC 7491 – Visibility protection for Federal class I areas

2018 42 USC 7491 – Visibility protection for Federal class I areas

2017 42 USC 7491 – Visibility protection for Federal class I areas

2015 42 USC 7491 – Visibility protection for Federal class I areas

2014 42 USC 7491 – Visibility protection for Federal class I areas

2013 42 USC 7491 – Visibility protection for Federal class I areas

2012 42 USC 7491 – Visibility protection for Federal class I areas

2010 42 USC 7491 – Visibility protection for Federal class I areas