2023 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2022 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2020 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2019 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2018 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2016 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2015 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2014 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2013 Washington Code 28B.50.510 – State purchasing and material control, community college purchases

2009 Washington Code 28B.50.510 – State purchasing and material control, community college purchases