Middle-earth
Another example is C. S. Lewis's "Space Trilogy," in which Earth is also called Middle-earth. Lewis's novels are situated at the approximate time of World War II, with the last novel, "That Hideous Strength," taking place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction. Merlin, of King Arthur fame, is treated as a successor to the Atlantis magic found within "Numinor" (Lewis's unintentional misspelling of Númenor), and similarities can also be found in the Quenya name for Númenor, which is "Atalantë," and Lewis specifically references the earth as Middle-earth twice, both in Chapter 13, "They Have Pulled Down Deep Heaven on Their Heads". Lewis's borrowings came directly from Tolkien himself: they were close friends and shared each other's literary creations. Lewis encouraged Tolkien to persevere with his Middle-earth writings.A small selection from the many books about Tolkien and his created world:
Tolkien fandom
Isaac Asimov, who had read "The Lord of the Rings" three times by Tolkien's death in September 1973, wrote a Black Widowers short story as tribute to the fellow author. "Nothing Like Murder" (1974) mentions college students forming Tolkien societies at Columbia and elsewhere. Tolkien's son Christopher began the publication of posthumous material, beginning with the "Silmarillion" (1977) which was being prepared for publication by Tolkien but left unfinished at his death, followed by "The History of Middle-earth" series (1983 to 1996). "" (1977) and "The Letters of J. R. R. Tolkien" (1981) provided biographical information. These publications provided the raw material for in-depth Tolkien research, pioneered by Tom Shippey's, "The Road to Middle-earth" (1982).