Question: Name the rivers which originate from within Pittsburg?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x prop:cities <http://dbpedia.org/resource/Pittsburg,_New_Hampshire> . ?uri onto:source ?x  . ?uri rdf:type onto:River}