Columbia subject headings:
Harvard subject headings:
Arthurian romances--History and criticism.
Grail--Legends--History and criticism
Literature, Modern--Themes, motives.
Princeton subject headings:
Arthurian romances--History and criticism.
Fantasy fiction--History and criticism.
Grail--Legends--History and criticism.
Literature, Modern--Themes, motives.
Quests (Expeditions) in literature.