Due to being out of print, I searched for used copies in good condition, covered them in clear covers, and stored them in a dark place as part of my collection. The front and back covers are all clean. There is no noticeable creasing on the top and bottom edges of the cover. There is a minor crease of about 2mm on the back cover of Volume 1, near the end of the text (see photo 7). Creasing on the top and bottom edges of the cover of Volume 3. Warping and a bend in the cover and text of Volume 4 (see photo 8). Please check the photos. I did not find any stains, dirt, or tears. There may be some age-related changes in the paper quality of the text itself. (I couldn't clearly determine the difference between each volume.) I tried my best to inspect them thoroughly, but please forgive me if I missed anything. Volumes 5 and 8 are first editions. The others were also published over 20 years ago. Considering the publication dates, I think the condition is quite good, and they are valuable books. How about it for those who want to keep them as a memento?