I came up with these dividers for my leveled readers to help keep them organized and neat. I am planning to model to my students on how to use them and how and where to put the books back. They can also keep track of which book the student is on. Dividers go up to lesson 10 for now. A couple of them may be doubled that would just be an extra.
I use my leveled readers in my centers when they read to someone.