2023 Ohio Code 1561.28 – Supervision of mineral resources management laboratory

2020 Ohio Code 1561.28 – Supervision of mineral resources management laboratory

2018 Ohio Code 1561.28 – Supervision of mineral resources management laboratory

2016 Ohio Code 1561.28 – Supervision of mineral resources management laboratory

2015 Ohio Code 1561.28 – Supervision of mineral resources management laboratory

2014 Ohio Code 1561.28 – Supervision of mineral resources management laboratory

2013 Ohio Code 1561.28 – Supervision of mineral resources management laboratory

2009 Ohio Code 1561.28 – Supervision of mineral resources management laboratory