This is a set of volumes 1-17. The bonus SL Word Partner is also included. However, volumes 3 and 17 are missing from the bonus. I also purchased this on Mercari, but I no longer need it since I've digitized everything on my computer. There are some creases in the booklets, possibly because it's been passed around a few times before me. I think you can sell it right away after you've digitized it. Thank you.