2023 Washington Code 41.32.780 – Teachers required to be members

2022 Washington Code 41.32.780 – Teachers required to be members

2020 Washington Code 41.32.780 – Teachers required to be members

2019 Washington Code 41.32.780 – Teachers required to be members

2018 Washington Code 41.32.780 – Teachers required to be members

2016 Washington Code 41.32.780 – Teachers required to be members

2015 Washington Code 41.32.780 – Teachers required to be members

2014 Washington Code 41.32.780 – Teachers required to be members

2013 Washington Code 41.32.780 – Teachers required to be members

2009 Washington Code 41.32.780 – Teachers required to be members