2024 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2023 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2022 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2021 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2020 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2019 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2015 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2014 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2010 30 CFR 816.101 – Backfilling and grading: Time and distance requirements

2009 30 CFR 816.101 – Backfilling and grading: Time and distance requirements