When did the book Watership Down earn the Carnegie Medal?
SELECT ?value1 ?value2 WHERE { wd:Q936801 p:P166 ?s . ?s ps:P166 wd:Q1043985 . ?s pq:P585 ?value1 . ?s pq:P1346 ?value2 }
watership down: Q936801 carnegie medal: Q1043985