NM (Near Mint) - Book appears to have never been read or been read 1-2 times. Cover is almost perfect, with crisp corners and no dings or creases. The pages are clean and white.
VF (Very Fine) - Book appears to have been read 2-4 times. Cover shows some slight shelf wear, with possible slight bending of the corners and possible light price sticker residue. Pages could be slightly yellow along the edges.
F (Fine) - Book would make a good addition to a collection. Covers shows quite a bit of shelf wear, with bent corners, some light dings, a small tear or two and possible price sticker or sticker residue. Pages show some yellowing.
VG (Very Good) - Book is a good reading copy. Covers shows definite shelf wear, along with several dings, creases and tears and bent corners. Pages are yellowed.
G (Good) - Book is a beat-up copy. Covers shows lots of shelf wear, along with dings and creases, tears and bent corners. Pages are yellowed.