wraps : The paper covering on the outside of a paperback.

vg : Very Good condition. can describe a used book that does show some small signs of wear - but no tears - on either binding or paper. Any defects must be noted. (defined by AB Bookman's Weekly)

trade paperback : Often used to indicate any paperback book that is somewhat larger than a mass-market paperback.

soiling : Generally refers to minor discoloration or staining.