Question: On which subjects does the author of the novel Thud! delve?
SPARQL query: SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Thud!> <http://dbpedia.org/ontology/nonFictionSubject> ?uri }
Answer: The non-fiction subjects of Thud! are [Chess, Racism, Troll, Sam Vimes, Dwarfs (Discworld), Ankh-Morpork City Watch, Ankh-Morpork, Fantasy, Minor Discworld concepts].