2024 16 USC 557a – Field season contracts; authority to make prior to appropriation

2023 16 USC 557a – Field season contracts; authority to make prior to appropriation

2022 16 USC 557a – Field season contracts; authority to make prior to appropriation

2021 16 USC 557a – Field season contracts; authority to make prior to appropriation

2020 16 USC 557a – Field season contracts; authority to make prior to appropriation

2018 16 USC 557a – Field season contracts; authority to make prior to appropriation

2017 16 USC 557a – Field season contracts; authority to make prior to appropriation

2015 16 USC 557a – Field season contracts; authority to make prior to appropriation

2014 16 USC 557a – Field season contracts; authority to make prior to appropriation

2013 16 USC 557a – Field season contracts; authority to make prior to appropriation

2012 16 USC 557a – Field season contracts; authority to make prior to appropriation

2010 16 USC 557a – Field season contracts; authority to make prior to appropriation