Dimensions differ for some volumes. Cover price may vary depending on printing. The first fifteen volumes come in both hardcover and softcover editions. The hardcovers are indexed separately. For the most part, the first fifteen had the indicia title of "Love and Rockets Book:" with the cover title coming after that. Most printings indicate this but some may not. After the fifteenth volume, all subsequent books use only the cover title and are therefore indexed separately. The numbering remains in use for those but only on a casual basis.