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