2024 26 USC 4221 – Certain tax-free sales

2023 26 USC 4221 – Certain tax-free sales

2022 26 USC 4221 – Certain tax-free sales

2021 26 USC 4221 – Certain tax-free sales

2020 26 USC 4221 – Certain tax-free sales

2018 26 USC 4221 – Certain tax-free sales

2017 26 USC 4221 – Certain tax-free sales

2015 26 USC 4221 – Certain tax-free sales

2014 26 USC 4221 – Certain tax-free sales

2013 26 USC 4221 – Certain tax-free sales

2012 26 USC 4221 – Certain tax-free sales

2010 26 USC 4221 – Certain tax-free sales