This is a detailed encyclopedia on passive building design methods, "Passive Building Design Methods for Utilizing Natural Energy, Revised Edition." I purchased a used copy on Amazon. There were many notes and highlighting with a highlighter from the time of purchase (there are no notes from me). See photos. There is a fold on the corner of the inside cover (see photo 8). There is no problem with reading it, but it is a book that feels used, so please purchase only if you can accept the notes, highlighting, folds, etc. It will be shipped via Yu-Yu Mercari Bin (Yu-Packet or Yu-Packet Post). If you are considering purchasing, please read the profile.