2023 Washington Code 78.52.140 – Carbon black and carbon products — Permit required

2022 Washington Code 78.52.140 – Carbon black and carbon products–Permit required

2020 Washington Code 78.52.140 – Carbon black and carbon products — Permit required

2019 Washington Code 78.52.140

2018 Washington Code 78.52.140 – Carbon black and carbon products — Permit required

2016 Washington Code 78.52.140 – Carbon black and carbon products–Permit required

2015 Washington Code 78.52.140 – Carbon black and carbon products–Permit required

2014 Washington Code 78.52.140 – Carbon black and carbon products — Permit required

2013 Washington Code 78.52.140 – Carbon black and carbon products — Permit required

2009 Washington Code 78.52.140 – Carbon black and carbon products — Permit required