Darkover (Publication Order) is a 30-book series with 30 released primary works first released in 1958 with contributions by Marion Zimmer Bradley, Diana L. Paxson, Cynthia McQuillin, Patricia Mathews, Eileen Ledbetter, Susan Schwartz, Elisabeth Waters, Kathleen S. Williams, Jacqueline Lichtenberg, Jean Lorrah, Mercedes Lackey, and Deborah J. Ross.