Here's mine mostly in the order I used them, plus a close-up look at the more interesting ones :> (censored all instances of my deadname)

The very beat-up composition books were from my middle school years. They mostly contain meme-y doodles, a mishmash of various interests, TAWoG fanart, and a silly comic series called President Baby and Diaper Bird. The pink one contains the origins of Chad and Cookie, the first OCs I really took seriously.
That big black one and the first three in the next row are from my first Pac-Man era. There's another big black book, but that one's at my best friend's house. The one that says SKETCH and the trippy-lookin ones are filled to completion, but the other two aren't. This is in the span of about 2 years.
That white one with the pencils on it spanned between my Deltarune, Dragon Ball, and My Singing Monsters eras, from 2021 to 2022. It contains one of my most beautiful pieces that I still love dearly to this day, even if the anatomy's pretty wonky

That brown one with the stickers and the SCAD one contain my MSM, JoJo, and Miitopia eras, from 2023-2024. I didn't actually go to SCAD, that book was a handout from a college fair.
The first three on the bottom are the ones I used throughout my high school junior and senior year art classes, and mostly contain thumbnail sketches of my projects.
The black one with more stickers mostly covers my Regretevator era. I really miss the lore and designs I made for it, I wish the community wasn't such a hostile environment. On the bright side, it all led to the creation of Brim and Ming, and the very first sketches of them were made in this book.
The Incredibox one is my current sketchbook. Unfortunately, even though I treat it carefully, the pages keep falling out, so they're out of order and all over the place now.
These are 10 years of my life and 10 years of art history, waow