2024 43 USC 1572 – Canal or canal lining

2023 43 USC 1572 – Canal or canal lining

2022 43 USC 1572 – Canal or canal lining

2021 43 USC 1572 – Canal or canal lining

2020 43 USC 1572 – Canal or canal lining

2018 43 USC 1572 – Canal or canal lining

2017 43 USC 1572 – Canal or canal lining

2015 43 USC 1572 – Canal or canal lining

2014 43 USC 1572 – Canal or canal lining

2013 43 USC 1572 – Canal or canal lining

2012 43 USC 1572 – Canal or canal lining

2010 43 USC 1572 – Canal or canal lining