SWM wrote:Yes, books can have more than one genre heading, just like they can have more than one subject heading. For instance, I can name a number of books which should get both Science fiction and Mystery and detective fiction genres, or Science fiction and Romance fiction genres.
However, some genre terms are subcategories of others, and that is defined in the genre list from the Library of Congress. Space operas (Fiction) is a subcategory of Science fiction. Anything with the genre Space operas (Fiction) would not need the genre Science fiction. Librarians would give the most specific genre term(s) appropriate. If appropriate, a book could have two sub-genres of a single broader genre, like Time-travel fiction and Steampunk fiction.
If you looked in a catalog (which was configured to display genres appropriately) for the genre Science fiction, you would get a listing of titles and also notes to See Also: Space operas (Fiction), Cyperpunk fiction, Time-travel fiction, etc. Similarly, if you searched for the genre Space operas (Fiction), you would get a note to See Also: the broader topic of Science fiction.
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