Question: When was Boneland, the sequel to "The Weirdstone of Brisingamen" was written by English author Alan Garner in what year?
Sentence (from "The Weirdstone of Brisingamen"): The Weirdstone of Brisingamen: A Tale of Alderley is a children's fantasy novel written by the English author Alan Garner (born 1934).
Relevant evidence: Yes