I put these labels on the spine of my classroom books. They are organized by genre. I recommend putting a piece of packing tape or scotch tape over the label as it helps it to stay in place much longer!
These labels match the book basket/shelf labels that are in my shop. It is very helpful for students to have each book labeled on the spine so they know exactly where to put it in your classroom library. It also makes it very easy to go through your class library and make sure that all books are organized in the correct spot!
I printed these labels on Avery address labels. Product #18160 (30 labels per page)