Columbia subject headings:
Harvard subject headings:
Grail--Legends
Grail--Miscellanea.
Mythology--Miscellanea.
Religion--Miscellanea
Princeton subject headings:
Grail--Legends.
Grail--Miscellanea.
Legends.
Mythology--Miscellanea.
Religion--Miscellanea.
Trivia and miscellanea.