To Save A World : The Planet Savers / The World Wreckers / The Waterfall

An omnibus edition of the best-selling author's Darkover novels features World Wreckers, in which Darkover becomes the target of an intergalactic company that destroys the ecology and economy of a planet, and Planet Savers, in which a Terran doctor journeys to the unexplored regions of the Darkovan mountains in search of a cure for