Columbia subject headings:
Harvard subject headings:
Animals in literature
Arthurian romances--History and criticism.
Civilization, Medieval, in literature.
Gottfried, von Strassburg, active 13th century. Tristan.
Knights and knighthood in literature.
Nibelungen in literature.
Nibelungenlied.
Plants in literature.
Tristan (Legendary character)--Romances--History and criticism.
Princeton subject headings:
Animals in literature.
Gottfried, von Strassburg, active 13th century. Tristan.
Nibelungenlied.
Plants in literature.