New Book.
Secondary, very new. As a second-hand book, external May The acceptable range of natural and normal wear natural or slightly older (refer to photo). Almost brand new page for collectors with perfectly acceptable.
Secondary, relatively new. External wear May Significantly more serious or especially old (usually a long period of time due to the old version, and not artificial). Page May Slight curling, spline. The (for special shows).
Secondary, the older ones. Skin May Wear serious (for pictures). Page May Have curling, spline.The marginal damaged or smudginess (defiled area of more than one square centimeter size or defects in high-frequency will be for a special, and not for special shows).
Used old, and all kinds of problems, reading acceptable.