Hardcover. Book is in very good to excellent condition, except for one lower broken spine at page 55, only at the bottom. It looks like the reader was holding this heavy book with one hand. Tsk, tsk. Also, the reader noted certain paragraphs with pencil marks, which I have carefully erased using a Pink Pearl eraser.
If it wasn't for the two flaws, this book could pass for brand new, and the flaws are not visible at first glance. Paper quality is excellent, with thin pages that have a smooth feel to them.