This is a great old book. When you use it, just handle it gently to avoid any damage. Since it's an old book, the pages might be a bit brittle, so turn them carefully. Keep it in a dry place away from direct sunlight to prevent further darkening of the text block. If you want to clean it, use a soft, dry cloth to gently wipe the cover. And because it's a former library copy, you can enjoy the unique history that comes with those markings.