2023 Ohio Code 1561.20 – Qualifications of surface mine blaster

2020 Ohio Code 1561.20 – Qualifications of surface mine blaster

2018 Ohio Code 1561.20 – Qualifications of surface mine blaster

2016 Ohio Code 1561.20 – Qualifications of surface mine blaster

2015 Ohio Code 1561.20 – Qualifications of surface mine blaster

2014 Ohio Code 1561.20 – Qualifications of surface mine blaster

2013 Ohio Code 1561.20 – Qualifications of surface mine blaster

2009 Ohio Code 1561.20 – Qualifications of surface mine blaster