Columbia subject headings:
Literature, Medieval--History and criticism.
Literature, Medieval--Themes, motives.
Nature in literature.
Harvard subject headings:
Animals in literature
Animals, Mythical, in literature.
Colors in literature.
French literature--Themes, motives.
French literature--To 1500--History and criticism
Nature in literature.
Plants in literature.
Princeton subject headings:
Literature, Medieval--History and criticism.
Literature, Medieval--Themes, motives.
Nature in literature.