Notes: Stated first edition. Full number line on copyright page indicates first printing. Date from Amazon.com. Cover art credited on the copyright page and rear jacket flap are not the same: Michael Roberts and Don Sipley are credited on the copyright page and Larry Rostant is credited on the rear jacket flap. Roberts and Sipley did the cover illustrations for the first two books in the series, but Rostant is fully credited for the fourth. In addition, Rostant claims the cover on his own book cover website, so is given credit here.