Knowing the topic will help me find the direct official resource for you.
The IRS provides sets of study and reference materials for tax preparers and the public in ZIP file format containing large-print PDF versions.
Official manuals for written materials and standardized paper formats (like the Talking and Point Paper format) are often distributed in document volumes such as DoDM 5110.04 .
If you are looking for specific paper types used in high-quality study materials, these brands are highly rated for academic use:
Famous Japanese notebooks known for specific "Study Planner" layouts and high-quality loose-leaf paper .