Purchased as a used item, though unused. The cover has creases and shows signs of wear, but the inside is very clean. Problems up to 2018 are included. Since the more recent past questions are in the regular red book, I think it's good because there's no overlap in the problems. I also bought an older one for that reason. I also have other reference books for sale, so bulk purchases are welcome. Feel free to comment. Please understand that this is stored by a private individual, so only purchase if you are okay with that. Please read my profile before purchasing. - Title: Osaka University Physics 20th Anniversary [6th Edition] - Publisher: Kyoikusha