2023 North Dakota Code 38-02-05 – Tunnel, opencuts, crosscuts, adits, or drilling equivalent to discovery shaft
2022 North Dakota Code 38-02-05 – Tunnel, opencuts, crosscuts, adits, or drilling equivalent to discovery shaft
2021 North Dakota Code 38-02-05 – Tunnel, opencuts, crosscuts, adits, or drilling equivalent to discovery shaft
2019 North Dakota Code 38-02-05 – Tunnel, opencuts, crosscuts, adits, or drilling equivalent to discovery shaft
2016 North Dakota Code 38-02-05 – Tunnel, opencuts, crosscuts, adits, or drilling equivalent to discovery shaft
2014 North Dakota Code 38-02-05 – Tunnel, opencuts, crosscuts, adits, or drilling equivalent to discovery shaft
2009 North Dakota Code 38-02-05 – Tunnel, opencuts, crosscuts, adits, or drilling equivalent to discovery shaft