IRS Long Sleeve
- $44.00
Tee shirt commemorating the moment Problem Library became an official non–profit organization.
Black 100% Cotton
Design/typography courtesy of the IRS
![](https://problemlibrary.org/app/uploads/2023/02/PL-Merch-501c3__ls_white_back.jpg)
Tee shirt commemorating the moment Problem Library became an official non–profit organization.
Black 100% Cotton
Design/typography courtesy of the IRS