Columbia subject headings:
Gregorius (Legendary character)--Romances--History and criticism.
Hartmann, von Aue, active 12th century. Gregorius--Sources.
Harvard subject headings:
Gregorius (Legend)
Hartmann, von Aue, active 12th century. Gregorius--Sources.
Princeton subject headings:
Gregorius (Legend)
Hartmann von Aue, 12th cent. Gregorius--Sources.