Heroic Archivist Notebook is a play aid for Heroic Archivist.
The PDF is 4 pages, and uses a great collage style layout that intuitively breaks up each page into fillable sections.
It's hard to overstate how nice the notebook looks, and it fits perfectly with the occult library vibe of the core game.
If you're planning to pick up Heroic Archivist, definitely get this too. And I strongly recommend checking out any other creations by the Notebook's creator. I'd honestly love to have a calendar or day planner in this style.