What has the author Norman Geddes written?

Norman Geddes (1923–1998) was an American science fiction writer. His most famous work is the novel "A Time of Changes" (1977), which won the Nebula Award for Best Novel and was nominated for the Hugo Award. Geddes's other works include the novels "The Hand of Zei" (1964), "The Witches of Karres" (1969), "The Unicorn Girl" (1970), "The Doomfarers of Coramonde" (1972), "The Crystal Palace" (1974), and "The Thirteenth Hour" (1980). He also wrote several short stories, many of which were published in magazines such as _Analog_ and _Galaxy_.