Columbia subject headings:
Harvard subject headings:
Merlin (Legendary character)--Romances--History and criticism--Congresses.
Robert, de Boron, active 13th century. Roman de Merlin--Congresses.
Robert, de Boron, active 13th century. Roman de l'estoire dou Graal--Congresses.
Princeton subject headings:
Arthurian romances--History and criticism.
Merlin (Legendary character)--Romances--History and criticism.
Robert, de Boron, active 13th century. Roman de Merlin.