Question: The Foreigner universe is a fictional universe created by an author that has written approximately how many books?

Context paragraphs:
Foreigner universe: The Foreigner universe is a fictional universe created by American writer C. J. Cherryh.  The series centers on the descendants of a ship lost in transit from Earth en route to found a new space station.  It consists of a series of semi-encapsulated trilogy arcs (or sequences) that focus on the life of Bren Cameron, the human "paidhi", a translator-diplomat to the court of the ruling atevi race.  Currently eighteen novels have been published between 1994 and 2017.  Cherryh has also self-published two ebook short story prequels to the series, "Deliberations" (October 2012) and "Invitations" (August 2013).

C. J. Cherryh: Carolyn Janice Cherry (born September 1, 1942), better known by the pen name C. J. Cherryh, is an American writer of speculative fiction.  She has written more than 60 books since the mid-1970s, including the Hugo Award-winning novels "Downbelow Station" (1981) and "Cyteen" (1988), both set in her Alliance-Union universe.  She is known for "world building," depicting fictional realms with great realism supported by vast research in history, language, psychology, and archeology.  Her series of fantasy novels set in the Alliance-Union universe, the Morgaine Stories, have sold in excess of 3 million copies.

Fantasy world: A fantasy world is a fictional universe created in fiction media, such as literature, film or games.  Typical fantasy worlds involve magic or magical abilities, nonexistent technology and sometimes, either a historical or futuristic theme.  Some worlds may be a parallel world tenuously connected to Earth via magical portals or items; a fictional Earth set in the remote past or future; or an entirely independent world set in another universe.

View Askewniverse: The View Askewniverse is a fictional universe created by writer/director Kevin Smith, featured in several films, comics and a television series; it is named for Smith's production company, View Askew Productions.  The characters Jay and Silent Bob appear in almost all the View Askewniverse media, and characters from one story often reappear or are referred to in others.  Smith often casts the same actors for multiple characters in the universe, sometimes even in the same film; Smith himself portrays the character of Silent Bob.

Isaac's Universe: Isaac's Universe is a fictional universe created by Isaac Asimov for other science fiction writers to use as a setting.  "Isaac's Universe: Volume One: The Diplomacy Guild", the initial collection of science fiction short stories, was edited by Martin H. Greenberg and published in 1990 by Avon Books.  It introduces the collaborative universe created by Asimov which eventually resulted in five volumes: three short story collections and two novels.

Master Chief (Halo): MCPON John-117, or "Master Chief", is a fictional character and the protagonist of the "Halo" fictional universe created by Bungie.  Master Chief is a playable character in the series of science fiction first-person shooter video games "", "Halo 2", "Halo 3", "Halo 4", and "".  Outside video games, the character appears in books and graphic novels—"", "", "", and ""—and has cameos in other "Halo" media, including "", "", "The Halo Graphic Novel", "Halo Legends" and "".

Horus Heresy (fictional event): The Horus Heresy is a cornerstone event in the far future fictional universe created by Games Workshop as the campaign setting for its "Warhammer 40,000" miniatures wargame.  It is a relatively short but devastating galaxy-spanning civil war that engulfs the nascent galactic empire of the Imperium of Man early in the 31st millennium of the universe timeline; the war is a major cause of the science fantasy universe's dystopian environment.  Initially described in wargame supplements published in 1988, and used as the setting for a 1989 "Epic"-branded tabletop miniatures wargame, it has been utilised since as background for several of Game Workshop's products.

Uplift Universe: The Uplift Universe is a fictional universe created by American science fiction writer David Brin.  A central feature in this universe is the process of biological uplift.

Amber Diceless Roleplaying Game: The Amber Diceless Roleplaying Game is a role-playing game created and written by Erick Wujcik, set in the fictional universe created by author Roger Zelazny for his "Chronicles of Amber".  The game is unusual in that no dice are used in resolving conflicts or player actions; instead a simple diceless system of comparative ability, and narrative description of the action by the players and gamemaster, is used to determine how situations are resolved.

Finisterre universe: The Finisterre universe is a fictional universe created by American science fiction and fantasy author C. J. Cherryh.  Currently, it comprises a series of two science fiction / horror novels written by Cherryh, "Rider at the Gate" (1995) and "Cloud's Rider" (1996), also known as The Rider Series.  They were published by Warner Books in the US and Hodder & Stoughton in the United Kingdom.  The series is about the descendants of lost colonists stranded many generations ago on the hostile planet of Finisterre.  For continuity, the two novels should be read in publication sequence.

Supporting paragraphs: Foreigner universe C. J. Cherryh
Answer: 60