2024 42 USC 9674 – Purchasing groups

2023 42 USC 9674 – Purchasing groups

2022 42 USC 9674 – Purchasing groups

2021 42 USC 9674 – Purchasing groups

2020 42 USC 9674 – Purchasing groups

2018 42 USC 9674 – Purchasing groups

2017 42 USC 9674 – Purchasing groups

2015 42 USC 9674 – Purchasing groups

2014 42 USC 9674 – Purchasing groups

2013 42 USC 9674 – Purchasing groups

2012 42 USC 9674 – Purchasing groups

2010 42 USC 9674 – Purchasing groups